Cool, collected Justin Timberlake can be intimidated with the simple mention of a common footwear accessory.

When the singer-turned-actor, 30, wisecracks his way down the line during the Friends With Benefits premiere held Monday at NYC’s Ziegfeld Theatre, he yuks it up about co-starring with Mila Kunis.

“My first reaction was, like ‘eww, gross. I don’t want to get in bed with her,’” he says. “I was like ‘Do I have to be in bed with her? I don’t want to do that, but I guess I’ll be a professional.’”

After he admits Mila looks good nude, things take a turn when Australian radio host Brad Blanks asks him about showing “a bit of booty.”

“I show more than a bit,” Justin says. “I’d rather not talk about it with a grown man. You are slightly sweaty right now, sir. It’s making me uncomfortable.”

Ah, but did he have to wear one of those socks?

“I don’t want to talk about that. Thank you.”

But that was the highlight of the film, he’s chided.

“The sock?” Justin replies.

Moments later, he’s asked what he thinks of the concept of friends with benefits.

“I think it’s a great movie,” Justin says with a wink. “I recall this film as a funny take on a ridiculous proposal.”

Friends With Benefits is in theaters Friday.

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