Famous vegans

Photo: Portia de Rossi and Ellen DeGeneres arrive to Covergirl Cosmetic's 50th Anniversary Party on Jan. 5, 2011, in West Hollywood, Calif.

Alec Baldwin

Photo: Alec Baldwin speaks at People For The American Way Foundation's 30th Anniversary Celebration on Oct. 6, 2011, in New York.

Lea Michele

Photo: Actress Lea Michele arrives at the 63rd Annual Primetime Emmy Awards on Sept. 18, 2011, in Los Angeles.

Bill Clinton

Photo: Former President Bill Clinton promotes his book, "Bill Clinton Back to Work: Why We Need Smart Government for a Strong Economy" on Nov. 8, 2011, in New York.

Chelsea Clinton

Photo: Chelsea Clinton attends the George Washington University kickoff rally on Oct. 18, 2011.

Mike Tyson

Photo: Former professional boxer Mike Tyson arrives at Comedy Central's roast of Charlie Sheen on Sept. 10, 2011, in Los Angeles.

Olivia Wilde

Photo: Actress Olivia Wilde arrives at the premiere of "In Time" on Oct. 20, 2011, in Los Angeles.

Alicia Silverstone

Photo: Alicia Silverstone arrives at the Weinstein Company & Dimension Films' American Film Market cocktail party on Nov. 7, 2010, in Santa Monica, Calif.

Russell Simmons

Photo: Russell Simmons attends the "CULO By Mazzucco" launch at the Tony Shafrazi Gallery on Oct. 9, 2011, in New York.

Tobey Maguire

Photo: Actor Tobey Maguire attends "The Details" premiere during the 2011 Sundance Film Festival on Jan. 24, 2011, in Park City, Utah.

Sandra Oh

Photo: Actress Sandra Oh arrives at the 42nd NAACP Image Awards on March 4, 2011, in Los Angeles.

Emily Deschanel

Photo: Actress Emily Deschanel attends Fox's Fall Eco-Casino party at Boa on Sept. 13, 2010, in West Hollywood, Calif.

Woody Harrelson

Photo: Actor Woody Harrelson arrives at the Academy of Motion Picture Arts and Sciences' 3rd Annual Governors Awards on Nov. 12, 2011, in Los Angeles.

Joaquin Phoenix

Photo: Actor Joaquin Phoenix arrives at PETA's 30th Anniversary Gala and Humanitarian Awards on Sept. 25, 2010, in Los Angeles.

Daryl Hannah

Photo: Actress Daryl Hannah attends the Montblanc "Collection Princesse Grace de Monaco" world premiere presentation at the Monte-Carlo Opera on Sept. 8, 2011, in Monaco.

Weird Al Yankovic

Photo: Musician Weird Al Yankovic arrives at Summit Entertainment's "The Twilight Saga: Breaking Dawn - Part 1" premiere on Nov. 14, 2011, in Los Angeles.

Petra Nemcova

Photo: Model Petra Nemcova attends MONTBLANC Launches Collection Princesse Grace De Monaco at the Princess Grace Awards Gala at Cipriani 42nd Street on Nov. 1, 2011, in New York.

Casey Affleck

Photo: Actor Casey Affleck attends the world premiere of "Tower Heist" on Oct. 24, 2011, in New York.

Heather Mills

Photo: Heather Mills attends the world premiere of "StreetDance 3D" on May 10, 2010, in London.

Steve-O

Photo: Comedian Steve-O arrives at the 2011 MTV Movie Awards at Universal Studios' Gibson Amphitheatre on June 5, 2011, in Universal City, Calif.

Bryan Adams

Photo: Canadian singer Bryan Adams poses after he is honored with a star on the Hollywood Walk of Fame on March 21, 2011, in Los Angeles.

Photo: Moby attends his "Destroyed" Book & Album Launch on May 11, 2011, in New York.