Olivia Wilde talked about appearing naked in new films "Cowboys & Aliens" and "The Change-Up."

She explained, "There's a little nudity in this one... I feel like if I feel really safe and if I feel like the story calls for it then I'm not so shy.

"And, as for 'The Change-Up,' I didn't really realize that's what was happening...People saw the movie and they're like, 'You know your butt's in the movie?' and I was like, 'What?' I had no idea!"

In "The Change-Up" a married father and a swinging single swap bodies after a wild night of drinking, and do their best not to throw each other's lives into complete chaos while scrambling to figure out a way to get back in their own skin.