Rooney Mara had to wear a merkin for her role in The Girl with the Dragon Tattoo. The 26-year-old actress admits a lot of discussion and planning went into what sort of pubic hair wig she would display in the film, because her character Lisbeth Salander is naked in so many scenes in the new thriller.

"There was a lot of discussion that went into my merkin for the movie, because I was naked quite a lot. And I don't think a lot of people will notice all of the attention that went into that. But there were a lot of discussions around that," she said in an interview.

One of the things the director David Fincher and the production crew wanted to get right was the color of the intimate hair piece. "Well, you know, in the book she's meant to have strawberry-blonde hair originally and she dyes it, so we had a special merkin made that was, you know, strawberry-blonde so that it would fit," Mara said.

The actress stars opposite Daniel Craig in the movie -- based on the Swedish novel of the same name by Stieg Larsson -- which comes to theaters on December 21.