Olivia Wilde Had No Idea That She Would Show Her Butt in The Change-Up

Olivia Wilde has two very different movies coming out in the next two weeks: one is a high-concept sci-fi thriller (Cowboys & Aliens) and the other is a lighthearted comedy that begins with Ryan Reynolds and Jason Bateman drunkenly urinating into a park fountain and later switching bodies (The Change-Up). There is a common thread that pulls these two projects together, though: Olivia Wilde appears nude ("nude") in both, even though the adventurous actress had no idea that was the case.

Although Wilde understood that she would be nude (from behind) for her role in Cowboys & Aliens, the actress wasn't clear on how much she was baring for the The Change-Up... until a few people who had seen the movie filled her in.

As told to Access Hollywood:

"With The Change-Up I didn't really realize that's what was happening, as if I didn't really know where the camera was. So then people saw the movie and they're like, 'You know your butt's in the movie?' and I was like, 'What?'" she explained. "I had no idea! But you know, I think when you agree to do a movie, like that you have to go 100 percent for it!"

So if you didn't have any desire to see The Change-Up, there is your incentive.

· Olivia Wilde Talks Going Nude For Cowboys & Aliens & The Change-Up [Access Hollywood]