"Your voice is important," the actress told her followers.
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"I voted today for the country I want to live in... a country where there is equality, inclusion, acceptance and freedom that EVERY American deserves," wrote Diaz. "Please go out and vote for the America you want to live in."
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"Hope everyone went out and #voted," Duff said on Instagram.
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Berkus and husband Jeremiah Brent brought daughter Poppy, 20 months, along to the polls.
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"Allow me to be the first to tell you that there's an election today and you should definitely vote in it," Williams joked. "Ps: they ran out of stickers at my polling place, but luckily I kept mine from the primaries. I guess it pays to be a casual hoarder?"
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The 18-year-old cast her first vote in a presidential election.
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DERAY MCKESSON & ANNA WINTOUR
The activist and the Vogue editor posed together after marking their ballots.
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"Brought my mom with me to vote today. She would have been so excited -- as are we!!" Shriver said on Twitter.
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"Voted and it feels so right #imwithher," Seyfried wrote alongside a picture with fiancé Thomas Sadoski.
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ELLEN POMPEO & DEBBIE ALLEN
The Grey's Anatomy costars took a field trip to the voting booths together.
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Hough was moved by her first-ever in-person voting experience. "I just had the most humane experience! Today was the first time I waited until Election Day to vote and be there in person with my fellow citizens! Every single person I came in contact with was filled with such honor and pride," she said on Instagram. "We exchanged smiles and projected an unspoken respect and love for one another…We can make a difference in how our voices are heard, how we treat each other, what we give to the world and what we take!"
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"I voted today for @hillaryclinton. I am so proud of all of you who did the same!" Cyrus wrote on Instagram.
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FELICITY HUFFMAN & WILLIAM H. MACY
The spouses picked up some extra stickers at the polling place.
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OLIVIA WILDE & JASON SUDEIKIS
Wilde got emotional while casting her ballot alongside fiancé Sudeikis and daughter Daisy, 1 month. "Baby girl's first election. It's a cool time to be alive. #tearsofjoy," she wrote.
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"Don't boo…vote!" the Jane the Virgin star tweeted.
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KEITH URBAN & NICOLE KIDMAN
The couple ventured to the polls side-by-side.
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ANNA CAMP & SKYLER ASTIN
"We voted!! And #werewithher," Astin captioned a sweet pic with wife Camp.
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"This nasty woman just voted today, before going to work. And I voted for Hillary Clinton. I'm hoping that you will vote today and you will stay in line, no matter how long it is. It was a long line for me this morning. And when you vote, vote for Hillary," the Veep star said in an Instagram video.
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Kaling rocked the vote and an American flag scarf.
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Jonas prominently displayed proof that he performed his civic duty.
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"Good times and long lines! Don't be discouraged by the wait. The lines move faster than you think," the comedian wrote on Instagram as she patiently waited to vote.
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"Telling my housekeeper Dulce to put her phone DOWN. No pics while voting. Get out and vote. It's about the most important thing you can do today," a cautious Stamos captioned a ballot-free photo from his polling site.
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"Everybody go vote! We are very lucky to live in a country where we can!" the Clinton supporter tweeted.
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"Feeling optimistic and hopeful that americans across the country will rise up with @hillaryclinton and usher in our future with a spirit of inclusion and possibility. proud to be supporting her in this historic election! I'M WITH HER!!" the Star Trek star shared on Instagram.
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TARAJI P. HENSON
The Empire star knows this election is in our hands.
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Hyland didn't waste time heading to the booth on a sunny Election Day.
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"Filled with alot of emotions today. But getting up early because we both have work to do and standing in line with my son as we wait to vote was a singular experience. So grateful to be with him as he voted for the 1st time," the actress captioned a photo with son Ian, 20.
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"One of the greatest privileges we have as Americans is a voice. I'm proud to say I did my part, now it's your turn. #ImWithHer," Kloss wrote on Instagram.
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Kendrick sported an "American Woman" T-shirt for her journey to the booth.
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Theroux had his say in American politics all the way from Germany via an absentee ballot.
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Lively's absentee ballot was no less important with a little chocolate smudge.
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"Right off the plane from Hawaii to go vote," the singer shared on Instagram.
"Our family voted and we couldn't be happier. How 'bout you??" Dunham captioned an Instagram selfie with her boyfriend.
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"No way does she grow up in your slo-mo temper tantrum version of America, @realDonaldTrump," Oswalt tweeted alongside a selfie with daughter Alice, 7.
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SARAH MICHELLE GELLAR
Gellar wrote a heartfelt message on Instagram about the election, sharing, "I normally try and keep things light on here, but today is a really important day. This election has sadly brought out the worst in people, and too many hateful comments." The actress added, "Yes #I'mWithHer. I realize she may not be everyone's ideal candidate but without question she is the most qualified person to run our country. I have a young daughter, and I want her to know that she can do and be anything."
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NEIL PATRICK HARRIS
Harris shared a photo of his sticker and a Martin Luther King Jr. quote: "Our lives begin to end the day we become silent about things that matter."
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Sims' daughter Scarlett, 20 months, "stole" her "I Voted" sticker.
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CANDACE CAMERON BURE
Bure was all smiles after earning her "I Voted" badge.
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Evans posted a photo of his voting proof along with "#ImWithHer" and "#StrongerTogether."
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"Confession: Today marks the first time I have ever voted for a president. My first eligible election, I was a registered NC voter living in NYC. My second presidential election I had to travel last minute and wasn't in town to vote. It feels pretty great. And Hank loved my sticker," Decker posted along with a snap with son Hank, 14 months.
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Gaga proudly displayed her election mail amid her campaigning for Clinton. "@realDonaldTrump you divided us with hateful language & fear. I love everyone in this country and I vote for @HillaryClinton to unite us," she wrote on Twitter.
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Hathaway got her vote in bright and early on Tuesday.
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Ferrera and husband Ryan Piers Williams twinned in N.Y.C. "I voted" stickers after the actress hit the campaign trail for Clinton.
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"Nothing like the feeling of witnessing your child vote for the first time. Nothing. MAKE IT COUNT!" Ripa captioned a post-booth selfie with 19-year-old son Michael Consuelos.
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SARAH JESSICA PARKER
"Good L_rd it feels good," Parker captioned a pic of her voting sticker, affixed to her white suit.
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Alba gave the democratic process one giant thumbs up, reminding her followers, "your voice matters."
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JESSE TYLER FERGUSON
"Civic duty! Tomorrow's the day ya'll! Get out and vote!" the Modern Family star wrote on Instagram Monday.
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The model mailed in her choices early.
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The Family Feud host made a pit stop outside of his polling place in order to proudly show off his sticker.
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Even letting people stare into his baby blues is less important to Somerhalder than getting out the vote.
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Come for the adorable baby cheeks, stay for the important message about voting.
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The country legend only had eyes for her polling place after casting her ballot.
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The soccer star ticked off the "last thing on my to do list" and managed to even fit in time for a quick picture afterwards!
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"This vote is woke," the former MSNBC anchor captioned her proud post-vote selfie.
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The actress couldn't contain her excitement about getting to vote early, if this happy selfie is any indication.
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The reigning Best Actress Oscar winner shared pizza with her fellow voters while in line.
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The proud Clinton supporter donned red, white and blue while voting for her gal on her own birthday. "Gave myself the best birthday present ever by voting today," Perry wrote.
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The former Office star "nose" that democracy is important.
"When you're so turnt up about voting that you do a photo shoot with your sticker and think it's cool but then second guess it, but you've already posted, but at least you waited to get home before snapping so you won't almost go to jail," Biel joked on Instagram, referencing her husband Justin Timberlake's ballot selfie drama.
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"Glad to have voted, now let's get this thing wrapped up," the crooner captioned a Snapchat selfie.
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"If you don't vote you can't complain. It's your right & civic duty as an American to vote," Lopez urged his followers after submitting his ballot early.