Mila Kunis gets hot and heavy with Justin Timberlake in her new movie -- but apparently it wasn't as fun as it sounds.

"It's very awkward, it just is," Mila tells Ellen DeGeneres in an episode airing today, "I mean, the truth is, we got to have very uncomfortable scenes for two weeks."

Mila, who co-stars with JT in "Friends with Benefits," adds "There's like 150 crew men watching and you see each other's bits and pieces. The whole thing is just wrong."

Their movie opens July 2011.

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