Bill Clinton | Carrie Underwood | Ellen deGeneres | Portia de Rossi | Natalie Portman | Mike Tyson | Carl Lewis | Morrissey | Al Gore | Alicia Silverstone | Joaquin Phoenix | Woody Harrelson | Usher | Alanis Morrssette | Thom Yorke | Russel Brand | Pamela Anderson | Bryan Adams | Prince | Brad Pitt | Alec Baldwin | Fiona Apple | Linda Blair | James Cameron | Jessica Chastain | James Cromwell | Moby | “Weird Al” Yankovic | Barry White | Belinda Stronach | Robin Gibb | Heather Mills | Demi Moore | Carrie Anne Moss | Jason Mraz | Sinéad O’Connor | Petra Nemcova | Michelle Pfeiffer | Jared Leto | Avril Lavigne | Anne Hathaway | Famke Janssen | Serena Williams | Coretta Scott King | Anthony Kiedis | Daryl Hannah |  Ville Vallo | Emily Deschanel | Betty White | Casey Affleck | Daniel Johns | Erykah Badu | Liv Tyler | Moby | Ozzy Ozbourne | Samuel L. Jackson | Jorja Fox | Abu from The Simpsons | Alyssa Milano | Jamie Hince | Superman/ Clark Kent | Tom Kaulitz | Shania Twain | David Pearce | J.M. Coetzee | Gillian Anderson | Jennifer Connelly | Olivia Wilde | Tobey Maguire |  Venus Williams | Martina Navratilova

And many more.

Sources:
http://www.happycow.net/famous_vegetarians.php?orderby=vegstatus
http://www.huffingtonpost.com/2013/12/01/vegan-celebrities_n_4351908.html
http://www.laweekly.com/squidink/2011/11/28/top-10-famous-vegans
http://vegan.wikia.com/wiki/Famous_Vegans_and_Vegetarians
http://en.wikipedia.org/wiki/List_of_vegans
http://www.glamourmagazine.co.uk/celebrity/celebrity-galleries/2011/05/celebrities-who-are-vegan#!image-number=1

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