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OTRC: Mila Kunis says she dreaded sex scene with Natalie Portman

Mila Kunis talks to OnTheRedCarpet.com in November 2010 to promote her new film 'Black Swan'.

Doing a sex scene with Natalie Portman was not something that Mila Kunis looked forward to while filming the upcoming movie, "Black Swan."

In the Darren Aronofsky-directed film, which is set for release on December 3, Portman's character, Nina, is chosen to play the lead in "Swan Lake." She deals with a manipulative ballerina, Lily, who is portrayed by Kunis.

Kunis said the two actresses were serious when filming the passionate scene.

"I think we were like, 'Let's just get this over with,'" Kunis told Parade magazine. "It's uncomfortable doing a sex scene. It's just bizarre."

Kunis, who is 5' 3", had to slim down to 95 pounds for the role. She told KABC Television, OnTheRedCarpet.com's parent company, that it took her five months to lose 20 pounds. The 27-year-old actress said the first thing she ate when she finished filming was Chinese food from the airport. When she got home, she ate an "Animal Style, double-double cheeseburger" from popular fast-food chain In-N-Out.

Kunis also opened up about filming sex scenes with costar Justin Timberlake in the upcoming film, "Friends with Benefits." She told Parade Magazine that Timberlake made it easier by joking around.

Kunis, who was born in what is now Ukraine and who also grew up in the United States, is known for her roles on "That 70's Show," "Family Guy" and "Forgetting Sarah Marshall."

Portman, 29, told OnTheRedCarpet.com that playing a troubled ballerina in "Black Swan" fulfilled her childhood dream of becoming a dancer.

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