Natalie Portman's 3D worry

Reuters

SHOWING FLAWS: Natalie Portman worries her first 3D film will make her look flat chested.

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Natalie Portman has joked she is concerned about appearing in her first 3D movie, in case she looks "flat chested".

The beauty plays nurse Jane Foster in the highly-anticipated Thor and claims shooting a movie in 3D made her anxious about her appearance. Natalie wants to look her best in the movie and is worried fans may be disappointed when they see her in an extra dimension.

"Yeah, I don't want people to think I'm flat chested!" she laughed at a press conference for the new Marvel Studios film.

Natalie has also revealed she loved working with Kat Dennings and Jaimie Alexander.

The 29-year-old star enjoyed shooting scenes with her female co-stars and was thrilled the script allowed the women to be actively involved in the story, rather than just helpless bystanders.

"It was great to be able to highlight a female friendship and female comradery and shared scientific passion among women," she explained. "And then, there's also this great character that Jaimie Alexander plays, called Sif, and we got to work with her, too.

"We had a good female power on the film."

Meanwhile, Natalie has denied she has been approached about playing tattooed computer hacker Lisbeth Salander in a Hollywood remake of The Girl with the Dragon Tattoo.

However, she has revealed she is a fan of the trilogy of books written by late author Stieg Larsson, which inspired the movie.

"I really like the books, but I've not been approached at all. Any of that is pure rumour," she insisted.