"The Girl with the Dragon Tattoo" star Rooney Mara is really starting to embrace her bold new look!

With dark hair and blunt bangs, Mara stole the show on the red carpet today in London for the movie's world premiere. Her white lace gown, which showed off a whole lotta back, was gorgeous too -- and was a great contrast next to co-star Daniel Craig's black ensemble.

Rooney's sophisticated look today is a far cry from how she looked last year at the "Nightmare on Elm Street" remake premiere (below, right), where she looked more like the Girl Next Door than Fashionista.

Which look do you prefer? Sound off below -- and check out more premiere pics in the gallery above.

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