And now the actress, 26, is pulling another style 180, showing off her feminine side on the cover of Vogue's November issue.
Inside the magazine, Mara poses in stunning gowns by Marchesa and Vera Wang, against an enchanted fairy tale background.
|Rooney Mara For Vogue|
"Before, I dressed much girlier," she told Vogue of her physical transformation for the flick. "A lot of blush-colored things. Now I literally roll out of bed and put on whatever is there. I have really enjoyed being a boy this last year."
To achieve her look in the film, Rooney had to cut off all of her hair and dye it black as well as bleach her eyebrows. She also received several piercings in one day.
"The eyebrows were the biggest shock because that really changed my face, and I didn't recognize myself. But I was fine because I knew it was going to be really helpful for getting into character."
Girl With the Dragon Tattoo, which also stars Daniel Craig, hits theaters December 21.