The 31-year-old "I Don't Know How She Does It" star is the most recent actress to shed her clothes for PETA.
Of the nude shoot, she explains there were no lucky fellas there to see her live in the biff. "I was very clear about having an all-female shoot and the photographer (Emily Shur) is a friend of mine and she is fantastic and amazing and she has guys who set up, and they had to set up and leave," Munn told FOX411's Pop Tarts column of the shooting experience. "I felt very comfortable once I knew that there were only girls."
Check out which other leading ladies have stripped down for animal rights.
(Photo credit: PETA)
Polish stunner Joanna Krupa stripped down for new PETA holiday ads that hope to discourage pet store puppy sales.
The new campaign will be featured on billboards across the country.
"We're trying to spread the word that breeding isn't the way to go," says Krupa. "Somebody needs to put their foot down and stop this breeding and these puppy mills... It makes me so angry that our government doesn't do anything about it. So I am!"
This isn't the first time Krupa has gone sans skivvies for PETA. Check out her PETA greatest hits, and more billboards from PETA stars past.
(Photo credit: PETA)
Wonder if vampires can see their butts in a mirror?
Dominique definitely has a few more lessons to learn about animal cruelty, given her recent puppy dump.
Eva Mendes would rather go naked. Surprise, surprise. Frankly, it would be more shocking if she said 'I'd rather wear clothes.'
To help those who swim: Pam Anderson really does gives fur (and meat) the cold shoulder. Too bad she didn't give her last 10 boyfriend/husband/lovers the same.
On a whim: It's safe to say Jenna Jameson would take off her clothes for just about anything. But is it just us, or is there something strangely sad about her posing next to an ad saying too much sex can be a bad thing?
For those who swim: Ok, ok, so it's no secret that Holly Madison loves her furry friends. Her ad proclaims her hate for fur as she says she "always fakes it." When your ex-boyfriend is an octogenarian, is that really a big surprise?
For those who swim: Why did Alicia Silverstone have to be naked to tell the world she's a vegetarian? We aren't sure we see a connection, but she looks nice.
On a whim: Maggie Q poses with some strategically placed chili peppers ... that just looks uncomfortable?
For those who swim: Kimora Lee says we should be an angel for dogs, and we believe she'd do the same for the fishies. Sadly that little pup is now in doggie heaven too, but not from his owner's cruelty.
On a whim: A naked holiday greeting from Christina Applegate, just what we wanted from Santa.
Deeta Von Teese
On a whim: Dita Von Teese posed to raise awareness for starving dogs. Yea, we don't see the connection either.
For those who swim: Nothing says patriotism like nudity in the name of helping the animals.
On a whim: Danity Kane says they'd rather go naked ... and they apparently would rather not be a band anymore either.
Dennis Rodman and Steve-O
For those who swim: Even some guys strip down for PETA. But rather than Dennis Rodman and Steve-O, can we get someone we actually WANT to see go naked?
On a whim: The buns say it all.
Some of the biggest names in Hollywood strip down for animal rights.