Rooney Mara's sister Kate, NFL connection and more fun facts

rooney-kata-mara-getty.jpg Rooney Mara (above, left) was announced as the titular role in "The Girl With the Dragon Tattoo" Monday (Aug. 16) -- but who is she? Here are five quick facts about the girl who beat out so many young female starlets for such a coveted role.

1. Mara's older sister Kate Mara (above, right) is none other than one of the cheerleader threesome members on "Nip/Tuck" and Annie Cantrell in "We Are Marshall." Rooney got her acting start in a bit part in her sister's 2005 video release "Urban Legends: Bloody Mary."