Kate and Rooney Mara

( From left: Alberto E. Rodriguez / Getty Images and Mark Mainz / Associated Press )

They might be football royalty, but the Mara sisters are all about acting these days. Kate, left, got the acting bug first, launching her career in 1999 with "Random Hearts." She went on to win roles in film's like "Brokeback Mountain" (as Heath Ledger's character's daughter), "The Shooter" with Mark Wahlberg and "127 Hours" with James Franco. Rooney (real name Patricia), two years younger, teamed with her sister for the horror movie "Urban Legend: Bloody Mary." From there she took small roles until landing a part in "A Nightmare on Elm Street." However, she didn't reach star status until she met director David Fincher, who hired her to play Mark Zuckerberg's girlfriend in "The Social Network" and later gave her the coveted role of Lisbeth Salander in "The Girl With the Dragon Tattoo."

Aside from their acting credits, the sisters, who have an older brother, Daniel, and younger brother, Conor, can boast an impressive football family history. The Mara family owns the New York Giants and the Pittsburgh Steelers, and the actresses are also the great-granddaughters of the teams' founders Tim Mara (Giants) and Art Rooney (Steelers).