Rooney Mara did her best Jennifer Lopez impression, stepping out in a plunging dress (it dipped down to her navel!) on Tuesday.
The Girl With the Dragon Tattoo star, who favors minimalist styles and neutral colors, donned the plum-colored J. Mendel design at the 2012 Costume Designers Guild Awards in Beverly Hills.
Mara, 26, paired the revealing look with nude peep-toe platforms and deep burgundy lips. Her hair, which she chopped off and dyed jet black to play a punk computer hacker in the flick, was slicked back.
And her onscreen character Lisbeth Salander left a mark on the actress' personal style, too. "I used to wear a lot of girlie, frilly things, now I buy things that are more comfortable, and more utilitarian, and sort of boyish."