Career: Actor
Famous Family: NY Giants VP Timothy Mara (father); NY Giants founder Tim Mara (great grandfather); Pittsburgh Steelers founder Art Rooney Sr. (great grandfather); actress Kate Mara (sister)

While actress Kate Mara was quietly building a nice little career for herself in film (Brokeback Mountain) and television (Entourage), little sister Rooney seemed to swoop in and steal the spotlight. After starring in the remake of A Nightmare Before Elm Street, Rooney landed a small but pivotal role in David Fincher's Oscar-nominated The Social Network. The notorious perfectionist must have liked what he saw, because he cast her as the star of his 2011 adaptation of The Girl With the Dragon Tattoo, beating out plenty of other veteran actresses vying for the part. The film earned her both Oscar and Golden Globe nominations for Best Actress—all at the age of 26.

With upcoming roles in Steven Soderbergh's Side Effects, Terrence Malick's new project, and Spike Jonze's Her, this NFL princess could not be hotter.