Rihanna
The singer supports the Democratic presidential nominee by rocking a vintage Hillary Clinton t-shirt on the streets of New York City.
Julia Roberts
She's with Her! The award-winning actress flashes her famous smile before entering the Hillary Victory Fund Stronger Together concert in New York City.
Demi Lovato
"I am voting for her because I truly believe that there is nobody more qualified to run this country—our country—than our Secretary of State," the pop star said at a rally in Iowa City, Iowa.
Elizabeth Banks
"Women's rights, universal Pre-K, family planning, affordable college, affordable healthcare, middle class tax relief, makes Hard Choices. Nobody's perfect but nobody's more qualified for our top job than @HillaryClinton. First Lady, Senator, Secretary of State, life-long service to this country and its citizens," the Pitch Perfect 2 director wrote on Instagram on June 23, 2015. "She has my vote in 2016. #HillaryforAmerica #Hillary2016."
Lena Dunham
"Had the pleasure of visiting campaign headquarters in my very own Brooklyn!" the Girls star and creator said on Instagram on May 29, 2015. "Didn't find the grande dame herself but this bumper sticker is pretty dope... Getting excited."
Jennifer Lopez
After Clinton announced she's running, the American Idol host told E! News, "I'm very excited by the news...I think it's time for a woman [president]."
Olivia Wilde
In an interview for The Daily Beast, the Tron star said, "I think Hillary is a really exciting candidate for so many reasons but she has a lot to prove to a lot of people. And I think she's up for that."
Ariana Grande
The 21-year-old pop star tweets, "yaaas @hillaryclinton."
Jesse Tyler Ferguson
The Modern Family actor tweets, "I have an announcement: I'm not running for president. Yay #Hillary2016 !"
Josh Peck
Drake's brother tweets, "Hillary's mah Homie"
Padma Lakshmi
The Top Chef host tweets, "Oh yes, it will finally happen. #Hillary2016"
Lena Dunham
Gilrs star tweets, "This is Hillary reading a text from me that says 'with you every step of the way, gurl' #mypresident"
Uzo Aduba
"Crazy Eyes" from Orange is the New Black keeps it simple on Twitter, "Hillary."
Ellie Goulding
The British singer tweets with the prayer hand emoji, "Hillary."
Kat Dennings
The 40 Year Old Virgin actress tweets, "Hillary."
Diane Kruger
The Inglorious Basterds femme fatale tweets, "Please America, make her President! #UnitedweStand#GodBlessAmerica."
Beth Behrs
The Two Broke Girls beauty tweets, "She's ready. We're ready. #ReadyForHillary let's do this! #Hillary2016#HillarysBigAnnouncement."
America Ferarra
The Ugly Betty star tweets, "I believed in her then, I believe in her now. @HillaryClinton#mypresident Me and @ambertamblyn stumping in 2008."
Carole King
The singer shared, "You've Got a Friend. I'm in."
RuPaul
The drag queen tweets, "You betta work, @HillaryClinton!"
Nicolas Sarkozy
Former French President tweets, "Good luck @HillaryClinton ! I know how strong your passion is for the United States. - NS"
Mike Birbiglia
Funny guy Mark Birbiglia tweets, "I like Hillary Clinton. I'm really hoping she does all the things Elizabeth Warren believes in."
Magic Johnson
The former Lakers point guard tweets, "I feel @HillaryClinton will be a great President for the American people and she will make sure that everyone has a voice!"