Occupation: Actress
Biggest accomplishment this year: Starring in Ain't Them Bodies Saints (set for an August 16 release), which was nominated for the Grand Jury Prize at this year's Sundance Film Festival

Fun fact that many don't realize about Rooney Mara: her family is NFL royalty; her mom's side founded the Pittsburgh Steelers, and her dad's side still owns the New York Giants. Beyond the gridiron, Rooney has carved out a very successful career for herself as an actress. She starred earlier this year in Steven Soderbergh's Side Effects, and will also appear with Amy Adams and Joaquin Phoenix in Spike Jonze's Her later this year. Mara also has also crossed over into the modeling world, recently becoming the of Calvin Klein's new "Down Town" fragrance. As if that weren't enough, she's a philanthropist as well, serving as president of the board of directors for her Faces of Kibera foundation, which provides assistance to kids in one of Africa's largest slums.