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Chelsea Handler, Mary McCormack and Charlize Theron
The BFFs were among the loudest marchers in Park City, Utah, where many celebs were participating in the rally as it coincided with the Sundance Film Festival. Handler also posted a video on Twitter, explaining why she was walking with "two of my besties," Theron and Mary McCormack. "We're here in Sundance and we're ready to march because we're going to get loud and proud," she explained, adding, "Everybody's going to stand together and we're going to come together. There's a movement happening! Get with it!"
Amy Schumer and Madonna
The Inside Amy Schumer star and pop icon were pure girl power in D.C.
Gloria Steinem and Katy Perry
The "Roar" singer had one word for meeting the feminist icon in Washington, D.C.: "Teacher."
Standing amongst the other protestors, Gyllenhaal listened quietly to the speakers in Washington, D.C.
If there were awards for the perfect poster, we're pretty sure the Supergirl star would have won handily. Benoist, wearing a gray "feminist" sweatshirt and red-and-white scarf, proudly held up a sign in D.C. that stated, "Donald, don't try to grab my pussy -- it's made of steel."
America Ferrera and Chrissy Teigen
The lovely ladies bonded in D.C., where Ferrera gave a stunning speech during the Women's March on Washington.
Jane Fonda and Miley Cyrus
Cyrus, a longtime advocate of Planned Parenthood, repped the organization as well as her own charity, Happy Hippie, in downtown L.A. Clad in plenty of HH swag, the "We Can't Stop" singer excitedly bounced around waving signs and bonded with fellow marchers, including Fonda.
The K.C. Undercover star put her yellow "Respect, Protect, Love the Black Woman" tee on display, simply captioning her Instagram pic, "That's right..."
The Ghost in the Shell star was among the celebs who gave fiery, impassioned speeches in D.C.
Olivia Wilde and Jason Sudeikis
The husband-and-wife duo traveled from New York City to walk in the Women's March on Washington. "That was the most incredible crowd I've ever been lucky enough to be a part of," Wilde tweeted after the rally. "I am blown away. WOW. We are a force to be reckoned with!"
Todd Williamson/Getty Images for Netflix
The Sundance darling proudly stood with Planned Parenthood in Park City.
The Beauty and the Beast star and proud feminist stood out in a sea of pink at the Women's March on Washington.
The Hidden Figures star got the crowd pumped up in D.C.
The singer-actress, who has also been actively protesting DAPL, was all about spreading the message of unity and equality in Los Angeles. Following the march, Lewis tweeted, "For what its worth- It's an AMAZING TIME to be alive! To organize. Create movements, actions, and just celebrate humanity w all of u."
The Chicago P.D. star proudly rocked her pink hat, complete with a women's symbol pin, at the Women's March on Washington, where she also took pics with fans and chatted with Gloria Steinem.
Demi Lovato and Lance Bass
The singers and LGBTQ activists reflected on the day in Los Angeles.
Jamie Lee Curtis
Over 750,000 people came out for the Women's March in Los Angeles, and the organizers captured a beautiful moment from one of the peaceful protesters, Curtis. "Standing for human rights!" they tweeted.
The High School Musical alum roared proudly in L.A.
The New York City native sang her anthem, "Girl on Fire," in the nation's capital. "No matter where you were today... We sent a powerful message!" she captioned a photo of herself smiling on stage. "I'm proud of everyone all over the world who gathered with such dignity and strength to send the message that we won't stop until we are heard! #WomensMarch #WhyIMarch #WomensRightsAreHumanRights #WeAreHere."
The Book of Love star captioned this black-and-white pic with three of her friends, "Proud pussy party. #WhyIMarch."
Mandy Moore, Jane Fonda and Katherine Schwarzenegger
The This Is Us star was in good company in L.A. "It's not a movement without #JaneFonda (and @rp1313 & @katherineschwarzenegger)... what a way to celebrate the collective energy of so many people unwilling to sit idly by. One for the books. ?? #womensmarch," Moore wrote on Instagram.
Pink and Carey Hart
The Los Angeles Women's March was a family affair for the singer and Hart. The husband-and-wife duo brought their 5-year-old daughter, Willow, and newborn son, Jameson, to the demonstration. "We march together," the 37-year-old singer captioned a family pic on Instagram, as she and Willow proudly held their signs up high.
Kerry Washington and Natalie Portman
The Nashville star shared an empowering message on Instagram after marching in Park City, Utah. "Today. Wowowow. Peaceful protest around the world. The energy merging us all together was palpable as we marched!" she wrote alongside a picture of herself holding up a sign in the middle of the Sundance crowd. "Healing, unity, hope, regeneration. Today is a powerful reference point. Forward. #WomensMarch #Sundance."
Cher and Chaz Bono
The diva and her son attended the rally in D.C. together.
Do not mess with Gina! "I walk for ALL THESE HERS. #womensmarch #womenUnited (CAUTION: mean comments will get blasted by my vagina)," the Jane the Virgin star, who was rocking a baby blue "Torch Your Bra" tee, wrote on Instagram.
Chloe Grace Moretz
The 19-year-old actress showed off her Hillary Clinton pride while marching with Jessica Chastain and taking photographs in D.C.
The Veep star wore her pale pink pussy cat hat proudly. "750k people at the LA March today. Yes we can," she wrote on Instagram.
Debra Messing and Julianne Moore
The Will & Grace star posted on Instagram that she and Moore were marching in D.C. with Moms Demand Action. "What an inspiring, exciting, gratifying, and comforting day, walking in lockstep with people of ever race, religion, sexual identity-- different groups being HEARD & SEEN," Messing captioned her selfie.
Todd Williamson/Getty Images for Netflix
The GRAMMY winner was among those who braved the snowy weather to March on Main in Park City.
The Zero Dark Thirty star's badge game was on point!
The mom of two -- who was rocking a black "Stronger Together" tee, fuzzy coat and red bandana necktie -- declared that she was "standing with my sisters today and EVERYDAY."
All the hand claps for the Dirty Dancing star's perfect, punny shirt, "Nobody puts pussy in a corner."
Judd addressed the crowd at the massive rally in Washington, D.C., reciting a poem by 19-year-old Nina Donovan titled, Nasty Woman.
Also participating in Park City's #MarchOnMain, the Orange Is the New Black star posed next to a posted declaring, "I can't believe we STILL have to PROTEST THIS S**T." "Love, not hate--makes America great," Prepon added in her Instagram caption.
Rosie Perez, Yoko Ono and Taylor Schilling
Prepon's OITNB co-star marched with Perez and Ono in New York City.
Cruz also repped OITNB, turning up at the march in Washington, D.C. "The rise of the Woman= The rise of the Nation ?? @womensmarch #womensmarchonwashington," she captioned an Instagram pic with six of her friends, with the White House making an appearance in the background.
The "Dangerous Woman" singer head to the march in downtown Los Angeles with a bus full of friends. "We the people all the people," she wrote on Instagram.
Amy Poehler, Jenni Konner and Lena Dunham
"Parks & Menstruation," Dunham cheekily captioned this pic of the trio in front of one of their rally signs reading, "Women are powerful & dangerous." The Girls star was clad in an official gray Lenny Letter sweatshirt that had the same slogan on it, as well as a a pink knitted "pussy hat," for the march in Washington, D.C.
There was a set of pussy cat hats in the Jessica Jones star's selfie.
Dressed in a comfy all-pink ensemble -- including neon fur lining her olive jacket -- the Scream star twerked alongside fans in D.C.
"On the way to downtown la! #WomensMarch shout out to women all over the world. Xo," the Frozen star tweeted.
Maxwell and Debi Mazar
Mazar ran into her old pal at the Women's March on Washington. "Me and @maxwell ..So thrilled to run into him!Friends for a long time!Amazing day w/women," she wrote on Instagram.