Actress Olivia Munn has shed her clothing for her second PETA ad, and this time she posed in her birthday suit for the animal organization's "I'd Rather Go Naked Than Wear Fur" campaign.

The Daily Show correspondent - a strong opponent of elephants being used in the circus - used her body to voice her opinions about elephant abuse in the past, and she even played a part in saving one of the pachyderms last November with the help of P!nk and other stars. The awareness campaign helped save an ailing elephant from the Ringling Bros. circus when the U.S. Department of Agriculture seized the animal organization.

Olivia's newest ad features the star posing in the buff with a lone rabbit and the tagline "Who needs fur to feel beautiful?" The ad was unveiled on a Los Angeles billboard earlier today.

"Please don't wear fur," she tweeted afterward. "Even a tiny bit of fur trim caused an animal extreme suffering & took a life."

Olivia's not the first to bare her flesh for PETA - check out past ads in the slideshow following her two new ads on the following pages...