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In what you can bet will be the first of many press stories about the film, Natalie Portman and Mila Kunis are keen to discuss just how utterly un-sexy their on-screen smooch in the upcoming movie ‘Black Swan’ really is.

Directed by Darren Aronofsky, [who is rumored to be set to direct the next Superman and the 'X-Men: Wolverine' sequel,] the film tells the story of a New York ballet dancer [Portman] whose place as the in-house prima donna is threatened by a new arrival [Kunis.]

“My character starts being paranoid that she’s going to be unseated,” Portman explained to reporters. “It’s a very extreme movie.”

And the girls got in shape for the job – Natalie spent 6-months training 6-8 hours a day, doing ballet, cross-training and swimming. Mila did cardio and Pilates exercises.

“I did ballet as a kid, like every other kid does,” Mila explains. “You wear a tutu and look cute and twirl. But this is different. You can’t fake it. Your whole body has to be structured differently.”

The two rivals form a tenuous friendship, which leads to an even closer connection.

Their now infamous love scene was originally scheduled to shoot over a day and a half, but Darren, 41, cut it short after feeling guilty about what he was putting the actresses through.

And he tells CNN the two off-screen friends were so nervous they even shared some Tequila before the cameras rolled.

“It’s two girls making out, and guys have a thing for that,” Mila added. “And Nat is a nerd’s idea of heaven. The whole thing is silly, but I can see why people care.”

Having enjoyed a successful tour of the film festivals the movie will open in limited release on December 1st. From there it’s up to the fans…