When it comes to animal cruelty, Olivia Munn is not clowning around.
Our comely colleague over at G4, (who returns to her post on Attack of the Show! tonight), appears in her birthday suit on a new PETA billboard to draw attention to the unethical treatment of circus elephants.
"I had seen a video online about the mistreatment and abuse of these elephants at the Ringling Bros. circus event," Munn tells PETA of her decision to get involved in the campaign. "I was brought to tears."
Sounds like the big top has hit rock bottom.
See who else is lending their celeb status for various causes in our Do-Gooder gallery.