Olivia Wilde has taken her top off for sexy photo shoots but for her latest flick she took it all off.  And it wasn't even the director's idea!

The drunken bonfire scene in Drinking Buddies, Wilde told the Chicago Sun-Times' Sunday magazine, Splash , was based on a bash the film's actors and crew had on a Lake Michigan beach.

"So the next night we did the bonfire scene and I thought, 'I should probably go skinny dipping.' And I ran into the water, and I didn't know what Jake Johnson was going to do! If he follows me into the water, we'll shoot something in the water. Or he doesn't. But I'm just as present in the scene as the audien