'Scary Movie' star Anna Faris is all toned up as an air-headed Playboy Bunny in her new comedy, 'The House Bunny,' in theaters August 22 -- and she's got the skinny on her new role for ET!

"My outfits are pretty skimpy in the movie, but it was fun for me; [my character is] not very self-conscious, clearly," says Anna, adding simply that for her sleek bunny bod, "I worked out."

And although she plays a well-intentioned but vacuous former Playmate, Anna has only good things to say about the real-life Playboy centerfolds, commenting, "I had never been to the [Playboy] mansion before. It turns out they're great women -- smart, funny."

When it came to Playboy Playmate etiquette she says, "There is a Bunny lady. There's a certain demeanor that's important to have. She coached me a little bit."

In 'The House Bunny,' Anna plays Shelley Darlington, a Playboy Playmate who is kicked out of the Playboy mansion because she's "too old" at the age of 27. Homeless and without a job, she moves in with the brainy college girls of Zeta Alpha Zeta and learns a thing or two about individuality and heart -- while they get a few tips on how to amp up their sex appeal and land the guys!

The film also stars Colin Hanks, "American Idol" runner-up Katharine McPhee, Beverly D'Angelo and Rumer Willis, who says, "I had a lot of fun. [Before the movie I'd] never worn shorts that tiny [and] shirts that push up, I guess. It's really fun."

Watch ET for more with the women of 'The House Bunny'!