Two of her great-grandfathers are NFL team founders. Art Rooney, founder of the Pittsburgh Steelers, is her mother's grandfather, and Tim Mara, founder of the New York Giants, is her father's grandfather.
Fell in love with theater and acting after attending a performance of Les Miserables at age 9.
Was accepted to New York University's Tisch School of the Arts but deferred attending due to her acting career.
Got her big break with a supporting role in the 2005 Oscar-winning film Brokeback Mountain, in which she played Heath Ledger's daughter—despite being only four years younger than Ledger.