The I Don't Know How She Does It actress stripped off to front the animal charity's latest anti-fur protest, appearing alongside the slogan "I'd rather go naked than wear fur".
"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," said Munn. "There's nothing good about pretending like you don't know."
Munn joins Pamela Anderson, Eva Mendes, Kelly Brook, Justin Bieber and Simon Cowell on the list of celebrities that have endored PETA campaigns.
The actress is reportedly dating New York Rangers star Brad Richards, and has been spotted at several of the team's games at at Madison Square Garden.
Munn will star alongside Channing Tatum and Matthew McConaughey in Magic Mike, which is released on June 29, 2012 in the US.
Watch Olivia Munn in a trailer for I Don't Know How She Does It below: