The beauty landed her breakthrough role in David Fincher's The Social Network and then beat out a number of stars, including Carey Mulligan and Scarlett Johansson, for the coveted lead role in the director's The Girl With The Dragon Tattoo remake.
But Mara insists her recent string of good luck has nothing to do with her football-loving great-grandfathers - Tim Mara, founder of the New York Giants and Art Rooney, founder of the Pittsburgh Steelers - revealing all her accomplishments are born out of hard work, not her lineage as an "heiress" or "trust-fund baby".
She tells Vogue, "I grew up in a little cul-de-sac in the suburbs and went to public school. I don't have a trust fund. When my great-grandfathers founded those teams it cost, like, $500. My dad is one of eleven children. I am one of 40 grandchildren.
"What bothers me about the whole trust-fund thing is that it sort of presumes that everything is handed to you. And if there is one thing about my family that I do identify with, it is that everyone is extremely hardworking."