July 21st, 2011
10:09 AM ET
While you will get to see Justin Timberlake strip down in this weekend's "Friends with Benefits," Mila Kunis opted to keep a few body parts private.
Talking to Ryan Seacrest on his radio show, Kunis revealed the process of casting a stand-in for her rear end.
“These young ladies came in and they were in a casting room and I was there with the casting director and make-up artist," she says. "These lovely women had to show us their derrieres and the chosen one resembled my body the most without looking like it's fake.”
Besides, she says, "I showed side-boob, and I figured I can't just give away everything all at once. I have to let out little pieces here and there."
And as far as entering her own "FWB" scenario, Kunis doesn't buy the premise.
"It is good in theory, horrible in execution," she tells Seacrest. "You either get promoted or you get fired. It can't last very long, because ultimately somebody will get feelings. Inevitably."
You can take a look at Kunis' substitute backside when "Friends with Benefits" opens on July 22.
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