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Sarah Silverman has been a vegetarian ever since she witnessed a turkey get killed on a farm when she was a kid.
Singer Kellie Pickler was a meat-loving country gal but says she didn't struggle too much giving up animal products.
Vegetarian Ke$ha wrote an angry letter to the CEO of McDonald's decrying their chicken slaughtering process.
Believe it or not, tough guy Mike Tyson is a vegan! He went on a severe detox from drugs and threw animal products into the mix.
Carrie Underwood has been meat-free for years, but has admitted to struggling with her now-vegan diet.
Russell Simmons has said that trying yoga made him want to try eating healthier, which led to him becoming vegan.
He's known for indulging in loads of things in the past, but Russell Brand was named PETA's sexiest vegetarian in 2011!
Paul McCartney has been a vegetarian for decades, with his now-deceased wife Linda writing vegetarian cookbooks and converting many of their friends.
Anne Hathaway went from a vegetarian to a vegan diet to slim down for her Catwoman role and decided to stick with it.
He was known for adoring McDonald's during his presidency, but Bill Clinton is now a vegan at the urging of daughter Chelsea.
Tia Mowry became passionate about a vegan lifestyle after a plant-based diet helped her endometriosis.
Jenna Dewan-Tatum has explained that her vegan diet is at odds with husband Channing Tatum's love of meat!
Tobey Maguire has been a vegetarian for over twenty years, keeping his diet even while bulking up to play Spiderman.
Woody Harrelson doesn't eat any animal products, sugar, or flour, and sticks to raw foods. That's dedication!
After publicizing environmental issues for years, it made total sense for former Vice President Al Gore to go vegan, too.
Natalie Portman has only given her vegan diet a break once (to vegetarianism!), which was during her pregnancy.