• PETA
    2 of 12

    OLIVIA MUNN

    Cause: Anti-fur 

    How She Got Involved: This isn't Oliva Munn's first time posing nude in the name of animals. In 2010, the "Newsroom" and "Magic Mike" starlet took a stand against circus elephants. This time, Munn is taking up with the popular "I'd Rather Go Naked Than Wear Fur" campaign. 

    "When you think about even that little tiny trim of fur on your gloves or on your collar, that is still coming from an animal that had to endure so much pain just for you. There's nothing good about pretending like you don't know," said Munn. She was also PETA's host for a video expose on fur farms in China.