Two Dresses, One Night!

Sometimes, one outfit just isn't enough!

Rihanna shocked plenty of people at the 2014 CFDA Fashion Awards on June 2, 2014 in her most revealing red carpet appearance ever, sporting a super-sheer Adam Selman creation covered in Swarovski crystals. But never one to be boring, RiRi did a complete 180 later that night and covered up in head-to-toe Tom Ford with a white satin blazer and a white jersey column dress, celebrating her big "Fashion Icon" award in New York City with family.

Emily Blunt attended a whopping three premieres in one day for her new film with Tom Cruise, Edge of Tomorrow, on May 28, 2013.

Here she is in a printed pink Osman dress at the London premiere, later stunning in a red form-fitting Prada gown at the New York premiere.

Keira Knightley wore a frilly Chanel Couture number to the closing night gala premiere of Begin Again during the Tribeca Film Festival on April 26, 2014 in New York City, and later changed into another Chanel Couture number that highlighted her tiny waist at the Chanel dinner in honor of the film.

Fashion's latest "It" girl Lupita Nyong'o sported a colorful orange and blue Vivenne Westwood dress at The Lourdes Foundation's "Leadership in the 21st Century" event in Los Angeles on February 26, 2014, before changing into this electric blue Stella McCartney number at the Chateau Marmont, where she was honored with a cocktail party by Sally Morrison and LoveGold.

Ellie Goulding went from one style extreme to the next at the 2014 BRIT Awards in London on February 19, sporting a princess-like Vivienne Westwood gown on the red carpet then changing into a sexy black bodycon dress for the afterparty.

Kat Dennings certainly made the most of her co-hosting duties alongside her 2 Broke Girls co-star Beth Behrs at the 2014 People's Choice Awards on January 8, 2014 in Los Angeles, sporting three different lovely dresses!

First, Dennings played up her pale skin and dark hair with a dramatic black strapless David Meister gown on the red carpet, before changing into a vibrant purple peplum dress and an elegant black floor-length gown throughout the course of the evening.

A glowing Olivia Wilde looked adorable in a demure Jason Wu embellished collar dress for the 71st Annual Golden Globe Awards Nominations Announcement in Beverly Hills, Calif. on December 12, 2013, before changing into a bright blue David Koma dress that showed off her growing baby bump for the Her premiere in Los Angeles.

Zoe Saldana sported a quirky Sachin + Babi printed ensemble for the 71st Annual Golden Globe Awards Nominations Announcement in Beverly Hills, Calif. on December 12, 2013, then later changed into a fashion-forward Marni ruffled peplum dress for the 2013 amfAR Inspiration Gala in Los Angeles.

Mariah Carey definitely didn't disappoint at the 2013 Rockefeller Center Christmas Tree Lighting Ceremony on December 3, 2013 in New York City, rocking her signature curve-hugging style with two dramatic dresses. Mariah first channeled a sexy Santa Clause in this corseted red gown with white fur, then later changed into a bedazzled white dress and matching elbow-length gloves.

Jennifer Lopez stole the show at the 2013 American Music Awards on November 24 in Los Angeles, sporting three different dramatic outfit changes in one epic performance paying tribute to Celia Cruz -- but it was her revealing purple Zuhair Murad jumpsuit that had everybody talking.

Katy Perry sported two wildly different looks on November 10, 2013, first sporting a ladylike light-blue Zac Posen dress and nude platform sandals on the 2013 MTV Europe Music Awards red carpet, then changing into a much racier sheer fishnet dress backstage.

From day to night! Rooney Mara wore a short black Louis Vuitton dress to the Her photocall during the 8th Rome Film Festival on November 10, 2013 in Italy, before completely switching it up in a futuristic white Balenciaga dress for the premiere.

Helena Bonham Carter debuted her new dread locks in a floral dress and boots at the 21st Annual Hamptons International Film Festival on October 12, 2013 in East Hampton, New York, before slipping into an eccentric black dress and heels later in the day.

It was a big day for Miley Cyrus Tuesday, as her highly anticipated new album Bangerz finally hit shelves.

And of course, not just one risqué outfit would do!

Miley first hit the Late Night with Jimmy Fallon stage in an oversized white shirt with a suspender bra over it -- sans pants -- before changing into ripped white jeans and a see-through crop top for her album signing in New York City. Her final look of the night consisted of a pink satin bra and a matching mini skirt, allowing her to let loose at her album release party.

But she did have one element tying her three looks together -- a pair of black-and-white Tuk creepers.

Which Miley outfit do you like best?

Sometimes, one outfit just isn't enough!

Kate Upton covered up at the Chanel show during Paris Fashion Week on October 1, 2013, wearing a chic blazer and black skinny pants. She later slipped into a more feminine style, rocking a sleeveless lace dress at the Mademoiselle C cocktail party.

Rizzoli & Isles star Angie Harmon sported a long-sleeved floral dress front-row at the Valentino show during Paris Fashion Week on October 1, before changing into a show-stopping sheer lime green gown for the Mademoiselle C cocktail party.

Sienna Miller was well represented at London Fashion Week on September 16, 2013, first attending the Burberry Prorsum Womenswear Spring/Summer 2014 fashion show in a furry cropped jacket and a green pencil skirt, before changing into a floral and lace Dolce & Gabbana dress to celebrate the Global Fund's first Green Carpet Challenge.

All eyes were on Jennifer Aniston at the Toronto International Film Festival, where she had a busy day on September 14, 2013, supporting her film Life of Crime. Aniston first sported her usual LBD at the film's press conference, then later changed into a tight-fitting light blue Vivienne Westwood number, once again fueling tabloid pregnancy rumors.

Julianne Hough attended the Marc Jacobs 2014 Spring Fashion Show  on September 12 during New York Fashion Week in this matching cropped sweater and skirt ensemble, then later changed into an ethereal white Emilio Pucci dress for the Estee Lauder "Modern Muse" Fragrance Launch Party.

The Host actress Saoirse Ronan rocked a tomboy chic look at the Guess Portrait Studio during the 2013 Toronto International Film Festival on September 10, supporting her film How I Live Now, then changed into an edgy Mary Katrantzou dress for the Don Jon premiere.

Mia Wasikowska proved a master at color-blocking in this Roksanda Ilincic shift dress promoting her film Tracks at the Toronto International Film Festival on September 10, then later slipped into a much more feminine pink sheer Azzedine Alaia dress for its premiere.

Brooke Shields was a busy woman on September 10, first attending Coastal Living magazine's celebration of their September issue in a blue-and-white dress, then getting New York Fashion Week ready in a vintage-looking green dress front row at the Dennis Basso fashion show.

Mila Kunis was sleek in all black at the Variety Studio at the Toronto International Film Festival on September 9, 2013, before completely changing gears in this plunging white Burberry Prorsum dress at the Third Person premiere.

Scarlett Johansson rocked a polka-dot Sachin + Babi dress at the Under the Skin pre-premiere dinner, hosted by Evian, at Variety Studio during the Toronto International Film Festival on September 9, 2013, before slipping into a fun purple and white Vivienne Westwood dress for the actual premiere.

Showing off her flare for the dramatic, Taylor Swift gave a sassy pose in this blue Oscar de la Renta dress at the Guest Portrait Studio at the Toronto International Film Festival on September 9. Swift was at the star-studded festival to promote One Chance, in which she's featured on the soundtrack. She later donned a sexier cut-out Calvin Klein dress for the film's premiere.

Olivia Wilde looked fantastic in a blue printed Antonio Beardy dress at the IMDb event at the Toronto International Film Festival on September 9, then dazzled again in a bright lime Valentino frock at the Third Person premiere.

Sometimes, one dress just isn't enough.

... Especially when it's New York Fashion Week!

Rashida Jones sported an impressive three different outfits in a day on September 8, 2013, hitting up three different fashion shows! First, she boldly mixed prints at the Opening Ceremony fashion show, sported short denim shorts and a seersucker blazer for the Band of Outsiders Women's show, then expertly rocked bright turquoise heels and a sweater-and-skirt combo at the Thakoon show.

Kelly Osbourne rocked a cleavage-baring knee-length green dress front row at the Zac Posen fashion show during New York Fashion Week on September 8, 2013, before changing into a flared black-and-white dress for the DKNY fashion show.

Elizabeth Olsen sported a Proenza Schouler dress and chunky heels at the Therese premiere during the Toronto International Film Festival on September 7, 2013, before changing into a more casual -- yet still chic -- skinny jeans-and-sweater combo for her interview at the Variety Studio.

Alyssa Milano sported an edgy striped peplum dress at the Tadashi Shoji Spring 2014 fashion show in New York City on September 5, 2013, then later changed into a white blouse and a leather skirt for the  Marissa Webb Spring 2014 fashion show.

Nicole Richie was well prepared for her hosting duties at the 2013 Style Awards in New York City on September 4, 2013, changing from an Antonio Berardi velvet crop top and pants ensemble she wore on the red carpet, to a show-stopping silver Giorgio Armani jumpsuit once inside.

Olivia Wilde looked amazing in an elegant white Theyskens' Theory dress for her guest appearance on the Late Show with David Letterman on August 19, 2013 in New York City, then changed into her second stellar look of the day -- a teal J. Mendel creation -- at the Drinking Buddies screening in Brooklyn.

Lady Gaga continued her promotion of her latest album ARTPOP and her new single Applause on August 19, 2013, changing into multiple scene-stealing outfits. First up was a racy white Mathieu Mirano creation showing off her strapless bra for her appearance on Good Morning America, followed by a far more conservative Balenciaga sweater and pants ensemble. Lastly, she changed into a plunging Balmain top and a purple mini skirt to visit Z100 music station in New York City.

Pretty Little Liars star Lucy Hale co-hosted the 2013 Teen Choice Awards alongside Darren Criss on August 11, 2013 in Universal City, Calif. in style, first showing some midriff in a white Houghton top and skirt on the red carpet, then later changing into a pretty pink strapless mini dress during the show.

The Butler star Minka Kelly looked picture-perfect in a girly blue-and-white DVF dress at the New York City press conference for the film on August 5, 2013, and later changed into a pretty printed one-shoulder Sophie Theallet gown for the premiere.

Sophia Bush made the most of her hosting duties at the Do Something Awards in Hollywood on July 31, 2013, showing off three gorgeous outfit changes!

First, Sophia walked the red carpet in a show-stopping blue and white Monique Lhuillier gown, then tried an edgier look in a custom-made yellow leather dress, before ending the night in a classically pretty white Paule Ka gown.

Jennifer Hudson showed a lot of leg in both her outfits changes at the Do Something Awards, first rocking a Versace ensemble on the red carpet, before going glam to perform in a leather mini skirt and black thigh-high boots later in the night.

Amanda Seyfried wore a surprisingly conservative long-sleeved Balmain ensemble and Rupert Sanderson heels to promote her racy film Lovelace on The Late Show with David Letterman on July 30, before changing into a strapless Givenchy zipper dress at the film's MoMa screening in New York City later that night.

Debi Mazar also made the rounds promoting Lovelace, wearing an underwhelming silver shirt and brown skirt combo to the film's press conference on July 30 in New York City, but then slipping into a fiery red lace dress for the MoMa screening.

Star Jones was feeling bold in this red leopard print jumpsuit at QVC's Super Saturday LIVE! event on July 27, 2013 in Water Mill, New York, before slipping into another show-stopping piece -- this time a sleeveless white feather dress -- at Russell Simmons' 14th Annual Art For Life Benefit in Bridgetown, New York.

Who knew iCarly star Jennette McCurdy was a Wu-Tang fan?! Jennette was all business at Variety's Power of Youth event in Universal City, Calif. on June 27 in a sleeveless minidress and pink open-toed heels, before getting comfortable in a Wu-Tang Clan muscle tee, skinny jeans and sneakers at the AGUAhydrate private event at the Bruno Mars concert in L.A. later that night.

Kristen Wiig continued with her polarizing fashion choices in this white Viktor & Rolf mini dress -- complete with a leather bib -- at a screening for her film Girl Most Likely in New York City on July 15, later changing into a casual-yet-classy blouse and shorts combo for her appearance on Late Night with Jimmy Fallon.

Mariah Carey showed the true meaning of the word diva in New York City on July 13, performing at the 2013 Major League Baseball All-Star Charity Concert in Central Park in a white dress with a matching bedazzled arm sling, then later changing into a black gown and a truly over-the-top feather-adorned arm sling.

Milla Jovovich sported a sleeveless top and a floor-length skirt at the Chanel Couture Fall/Winter 2013-2014 show in Paris, France on July 2, before later making another fashionable appearance at the Armani Prive Fall 2013 Couture show, clad in an ensemble from the designer's Spring 2013 collection.

A stoic Sandra Bullock stood out at a photocall for The Heat in Sydney, Australia on July 2 in a bright blue Alberta Ferretti pants-and-blouse ensemble, and later changed into an Emilio Pucci mini dress for the premiere.

Gabrielle Union hit the 2013 BET Awards red carpet in Los Angeles on June 30 in a figure-hugging red dress, before changing into a glamorous white gown that showed a whole lot of leg for her press room appearance

Co-host of the 2013 Miss USA pageant Giuliana Rancic lit up the red carpet at the Planet Hollywood Resort & Casino in Las Vegas on June 16, 2013 in this deep blue cobalt Randa Salamoun gown, before changing into a feathery nude show-stopper during the competition.

Carly Rae Jepsen sported a dramatic Carlie Wong gown on the 2013 amfAR Inspiration Gala red carpet at The Plaza Hotel in New York City on June 13, 2013, before changing into a royal blue suit to perform.

Jessica Alba sported a bright yellow Atelier Versace mini dress and orange Celine heels on the red carpet of the 2013 Spike TV Guys Choice Awards on June 8, 2013, and later changed into a more conservative two-toned Narciso Rodriguez dress and open-toed Giuseppe Zanotti pumps during the show.

Miranda Kerr showed off her model figure in a tight-fitting Herve Leger bodycon dress and bright coral Lanvin heels for her appearance on Fox & Friends, then later changed into a yellow lace Reem Acra dress for a stop on the Gillette Venus Step Up & Step Out tour on June 4, 2013.

Jessica Chastain showed off her stunning necklace from the Elizabeth Taylor Bulgari Collection to perfection in this white Versace gown at the Cleopatra premiere at the Cannes Film Festival on May 21, before ditching her sleeves for another white dress -- this one by Givenchy -- for the cocktail party.

Demi Lovato attended X Factor's Topshop photo call on May 13 in New York City in a leather mini skirt and a sheer white blouse, before slipping into an all-black ensemble for the FOX 2103 Programming Presentation Post-Party in Central Park.

Michelle Rodriguez stunned at the London Fast & Furious 6 premiere on May 7, 2013  in a strapless red gown, before changing into an equally sexy cut-out black dress for the after-party.

Mad Men star Jessica Pare dressed to impress at the 2013 Met Gala on May 6, 2013 in an unconventional Jason Wu skirt-and-pants ensemble, before changing into a tight-fitting pale blue minidress for the after-party at The Standard hotel in New York City.

Katy Perry was a busy gal on May 1st, first taking in the Kinky Boots Broadway show in a pretty printed Bottega Veneta dress, then later changing into a gorgeous blue Vera Wang dress to honor the designer at the 2013 Delete Blood Cancer Gala in New York City.

Eva Longoria looked chic in a pair of skinny jeans and a well-fitted blazer at the Hulu NY Press Junket on April 30, before changing into a sleeveless white dress and matching studded pumps for a Ferragamo event celebrating the 35th anniversary of their shoe line Vara in New York City.

Selena Gomez looked edgy in a black Vince top and a colorful Blumarine skirt on the 2013 Radio Disney Music Awards red carpet on April 27, before changing into a show-stopping blue getup to perform her new single Come & Get It.

Idina Menzel showed off her svelte figure in a tight-fitting black jumpsuit at the press room of the Laurence Olivier Awards on April 28, before slipping into an eye-catching red floral gown for the red carpet. 

Bryce Dallas Howard sported an eye-catching baby blue and orange dress with a navy blazer at the Women's Filmmaker Brunch during the 2013 Tribeca Film Festival on April 25, 2013 in New York City, then later changed into a sleeveless red dress and black heels at the Conrad Hotels & Resorts Brings Smart Luxury event.

Katy Perry wore a blue lace Monique Lhuillier dress to The Smurfs 2 photocall in Cancun, Mexico, before changing into a cleavage-baring strapless plaid dress for the 5th Annual Summer of Sony event on April 22, 2013.

Emma Roberts stunned in a purple Cushnie et Ochs dress and cut-out Walter Steiger heels at the premiere of her film Adult World during the 2013 Tribeca Film Festival on April 18, 2013, before changing into a slinky black Armani dress for the after party.

Beyonce worked an array of outfits for the kick-off to her 46-date Mrs. Carter world tour in Belgrade, Serbia on April 15, 2013. Many of looks, all created by high-fashion Italian designer Emilio Pucci, were sans pants. That being said, which sexy style is your fave? Vote now!

Paula Patton sported a high-neck, long-sleeved white Gucci gown at a New York screening of Disconnect on April 8, 2013, before drastically changing it up to a black lingerie-like mini dress at the after party.

Jennifer Lopez sported a nude Maria Lucia Hohan tulle dress with Christian Louboutin heels on the red carpet at Muhammad Ali's Celebrity Fight Night XIX in Phoenix, Arizona on March 23, 2013, before changing into a show-stopping red ensemble -- complete with a feather boa -- to perform.

Taylor Swift showed her flair for the dramatic during her performance at the 2013 Brit Awards in London, sporting a white wedding dress and then stripping down to perhaps her raciest look yet -- a black lingerie-like get-up paired with lace-up knee-high boots.

Emma Stone looked flawless in an orange and white Stella McCartney dress at the photocall for The Croods at the Berlin Film Festival, before changing into a polarizing -- and let's face it, a bit bizarre -- Gucci mini dress for the film's premiere.

A very tan Jennifer Lawrence sported a simple white Chloe dress at the 2013 Academy Awards Nominations Luncheon, before changing into an intricately embroidered Valentino dress for the 2013 The Hollywood Reporter Nominees' Night in Beverly Hills, California.

Amy Adams also sported two different looks on February 4, standing out in a purple J. Mendel dress at the 2013 Academy Awards Nominations Luncheon, before changing into a little black lace mini dress for the 2013 The Hollywood Reporter Nominees' Night.

Nina Dobrev wore a pretty blue lace Zuhair Murad dress at the 2013 NFL Honors in New Orleans Saturday, later changing into a sexy black lace number for DIRECTV's Super Saturday Night event.

Taylor Swift had jaws dropping at the 40 Principales Awards in Madrid, Spain in this plunging white Kaufman Franco dress, before changing into her performance outfit -- a red sequin top, high-waisted shorts and matching black sparkly oxfords.

Just when you thought Jessica Alba couldn't possibly top her melon-colored Oscar de la Renta gown she wore on the Golden Globes red carpet, she stepped out at the InStyle after party in this adorable checkered Louis Vuitton number.

Julianne Hough's frilly Monique Lhuillier gown might have polarized fashion critics earlier in the night, but she debuted another stunning dress -- this time by Jenny Packham -- later at the Weinstein company after party. Unfortunately, the delicate silk creation didn't make it through the night -- it ripped on account of the Safe Haven star dancing "too hard!" 

Jennifer Lopez landed on plenty of best dressed lists with her lacy nude Zuhair Murad gown on the Golden Globes red carpet, but later changed into another Zuhair Murad creation -- a silky black gown with a plunging neckline -- for the Weinstein Company after party.

Modern Family star Sarah Hyland was clearly aiming to show some serious cleavage Sunday night, stunning in a tight-fitting Max Azria gown for the Golden Globes ceremony, then changing into an equally revealing Pavoni dress at the Fox Searchlight after party.

Jessica Chastain sported a blue Antonio Berardi V-neck dress and ankle-strap Rupert Sanderson heels during her appearance on the Late Show with David Letterman, then changed into a lacy black Oscar de la Renta dress and Christian Louboutin pumps at a screening for her new horror film Mama later in the night.

Khloe Kardashian braved the cold Thursday night at The X Factor season finale in Los Angeles wearing a lacy green mini dress, then changed into a pink and green sparkly number to pose for the purple carpet.

Rose McGowan walked the red carpet of the Humane Society of the United States' New York gala in a black and cream floor-length gown, then later changed into a sexier leather and lace ensemble for the after party.

Jordin Sparks walked VH1's Divas red carpet in a glamorous gold Nicole Miller gown, and later showed some leg in a more casual printed dress backstage.

Keri Hilson rocked a form-fitting black Pucci suit at VH1's Divas event, and later changed into a super-sexy sparkly crop top and high-waisted white pants to perform.

Carmen Electra arrived at the 2012 American Country Awards in Las Vegas in a figure-hugging white gown, and later changed into an equally dramatic black backless number with strategic side cut-outs, showing off her toned stomach.

After stealing the show at the Les Miserables premiere in London in a white Givenchy Couture halter gown, Anne Hathaway did it again at the after-party, sporting a strapless Altuzarra dress and a dramatic deep blue cape.

Jessica Biel turned heads in an edgy one-shoulder Versace gown at the Playing for Keeps premiere in New York City, but changed into a bright aqua Nina Ricci dress for the film's after-party.

Singer Rita Ora arrived at Tuesday night's British Fashion Awards in London in a head-turning light-blue Vivienne Westwood gown, and later changed into an undoubtedly more comfortable loose-fit pants and sweater combo once inside the awards room.

Jessica Biel donned a backless black halter Gucci dress at the Hitchcock premiere in Los Angeles for the red carpet, and later showed some leg in a white satin Michael Kors mini dress and silver heels at the after-party.

Keira Knightley was the belle of the ball at the Anna Karenina premiere in Los Angeles, where she stunned in a custom mint green Erdem gown. She later switched it up in an equally colorful Richard Nicoll dress at the after-party.

Kate Moss sported two Marc Jacobs looks to celebrate the launch of her book Kate: The Kate Moss Book, the first a tight-fitting leopard number at her book signing at Bookmarc, the Marc Jacobs bookstore in London, the second a show-stopping gold creation she actually chose to wear backwards at the launch party.