Throwback Thursday! Star Flashback Pics

Rapper turned actor Mark Wahlberg posted this throwback photo on Instagram, writing: '#TBT @Celtics pride.'

Actor and Thirty Seconds to Mars singer Jared Leto posted this throwback photo on Instagram writing: "MARS. Paris. 2011. See you again next week, FRANCE.  #tbt"  His band will be returning to France on Feb. 14 to kick of their 2014 tour.

Even at age four, Taylor Swift was already a character. The 22 singer posted a video of herself talking on the phone, writing: "Christmas 1993, on a very important phone call with Britany. @britmaack" WATCH.

Actress/model Malin Akerman posted this photo on her Twitter, writing: "Alright people...guess how old I was in this picture?! #tbt."

Dawson's Creek star James Van Der Beek posted this flashback Facebook photo, writing: "#tbt Karate outfit courtesy of Mrs. Claus. Eye of the tiger courtesy of 100% unjustified swagger. My grandfather's socks? No idea what was going on there..."

Cindy Crawford is set to post a Facebook pic of Presley and Kaia Gerber from 2001, writing: "One of my favorite Christmas cards ...hard to believe that was 12 years ago. #TBT"

Pretty Little Liars star Lucy Hale threw it back all the way to 1994 with this holiday Facebook photo. 

Britney Spears' sister Jamie Lynn shared this flashback Facebook photo from Christmas 2001.

Ivanka Trump shared this holiday Facebook photo in the city, writing: "Nothing says the holidays in New York like a spin around #WollmanRink #TBT"

Celebrity stylist Johnny Wujek posted a Throwback Thursday photo of Miley Cyrus and Taylor Swift before all the twerking and Never Ever Getting Back Together began. Wujek captioned the Instagram pic, writing: "#tbt Grammys backstage. When they were babies. @mileycyrus @taylorswift #blackgowns"

Before James Franco landed his role as Alien in Spring Breakers, he was already dressing the part. The Oscar nominee shared a flashback photo of himself via Instagram, writing: "YOUNG ALIEN circa 1988."

Kelly Osbourne shared her Throwback Thursday photo a few days early. On Dec. 3, 2013, the Fashion Police star captioned this Instagram pic of her and her rocker dad Ozzy Osbourne, writing: "Today is my Dadda's birthday! Happy birthday Dad I am so proud to be your daughter! I love you sooooo much!!!!!"

Carrie Underwood shared not one, but all of her school photos. The country crooner tweeted: "Oh Goodness! Ha ha..."

Jennifer Lawrence has always been theatrical even before fame. The Hunger Games: Catching Fire star shared this silly pic, writing: "#tbt don't worry I've been properly medicated since this photo."

Lizzie McGuire star Hilary Duff shared a pic of her looking like she was starring in Toddlers and Tiaras. The actress/singer captioned her flashback Instagram photo, writing: "#tbt there are so many things wrong with this."

Though a great deal younger, Beyonce is still recognizable in this class photo. 

Martha Stewart shared this Halloween childhood pic, writing on her Facebook: "Me dressed up as Little Bo Peep at age four. What are you dressing up as for Halloween?"

Cindy Crawford and her husband Randy Gerber dressed up as Grease couple Sandra Dee and Danny Zuko. The supermodel wrote on her Facebook: "#ThrowbackThursday: Rande and I about ten years ago as Danny and Sandy from Grease at Herb Ritts' Halloween party! Happy Halloween!"

Before she was singing about her exes, Taylor Swift was hanging out with her mom in Tennessee and wearing "matching velvet holiday ensembles."

Following the release of Jay Z's highly acclaimed album Magna Carta, his proud wife Beyonce shared a childhood pic of the rapper. With the message "Bow Down" over the graduation photo, Bey wrote: "Platinum #MagnaCarta."

Before he was in costume for Magic Mike, Channing Tatum was dressing like a cowboy in his tiny tot years. 

Demi Moore and Bruce Willis' daughter Rumer Willis shared an Instagram photo of herself as an adorable tot on May 9, 2013. Rumer captioned the pic, writing: "Take that Minnie ...I look way better in those ears haha #throwbackthurs #disneyland."

Simon Cowell's fellow X Factor judge Demi Lovato shared a flashback photo of the 50-something TV star, writing: "Well, well. Look at this ancient pic I found!! Same t-shirt, same middle part.. Recognize this @SimonCowell??"

Before he was a Bravo star, Andy Cohen was mowing lawns in nothing but his skivvies. The late-night host shared a flashback photo on Sept. 19, 2013, writing: "An Epic #ThrowbackThursday - me, a speedo, a lawnmower. Discuss....."

Lindsay Lohan shared this old-school Christmas pic of her posed with mom Dina and brother Michael.

Kelly Rowland shared this adorable throwback pic on October 10, 2013 of her and her Destiny's Child pal Beyonce. "One of the most precious gifts from GOD! #friendship #MisterandPete," she posted on Instagram.