2. She underwent a drastic physical transformation for The Girl with the Dragon Tattoo.

To become the haunting and provocative Lisbeth Salander that director David Fincher envisioned, Rooney Mara had to give up the down-to-earth, pleasant image she was slowly beginning to develop in the eyes of the public.

For the role, Mara obviously had to learn more than how to sling a gun and ride a motorcycle; she sliced off her long brown hair for a jagged, black cut, bleached her eyebrows, allowed her skin to turn almost transparently pale, had her thin frame riddled with fake tattoos, and, most starkly yet characteristic of the novel's heroine, had her nipples pierced. The end result is insanely sexy, yet also pretty intimidating.