People for the Ethical Treatment of Animals [PETA] compiles the list every year, with Get Him to the Greek star Brand, 36, and Wiig, 37, beating Natalie Portman, Joaquin Phoenix, and Anne Hathaway to earn the the title of World's Sexiest Vegetarian this year, US website Gossip Cop reports.
Bridesmaids actress and Saturday Night Live star Kristen recently said that she has made soy and tofu a big part of her diet.
And Russell once said that you shouldn't eat animals because it's 'mean to them'.
Last year, Olivia Wilde and The Biggest Loser trainer Bob Harper were picked as the hottest vegetarians.