Olivia Munn, co-host of G4’s Attack of the Show!, bares all in a new ad for PETA encouraging fans to boycott the circus and let elephants be free as nature intended.

The actress, who stars in Iron Man 2 this summer, became involved with the PETA campaign after seeing a Ringling Bros. video online which showed the animals being tortured by their handlers.

“When you look at something like the circus and everyone’s laughing and there’s color and there’s music and everything seems so great,” says Munn. “But when you go right behind that door and they’re in these crates all day long and then they’re getting shocked and beat just so they can get up and dance around on a ball … it was just so sickening.”

Munn encourages people to use Twitter, Facebook, and other social networks to spread the message about the mistreatment of circus animals.

The easiest things to do to help animals, according to the 29-year old, is stop going to the circus, don’t buy real fur, and adopt rather than purchase a dog.

Now through May 24, PETA will be giving away 5 copies of the anti-circus ad signed by Olivia Munn. Visit PETA.org to get your copy!