September 06, 2010 12:00 PM

>Five things to know about the dark horse, 25, who beat out a slew of A-listers to play The Girl with the Dragon Tattoo’s fierce, pierced heroine.

1 SHE’S FOOTBALL ROYALTY

Mara is related to the founders of both the New York Giants and the Pittsburgh Steelers.

2 SHE’S NO FACEBOOK ADDICT

“I very rarely use it,” Mara, who stars in the upcoming Facebook movie The Social Network, told Paper.

3 ACTING RUNS IN THE FAMILY

Her big sister Kate has appeared in Brokeback Mountain and We Are Marshall.

4 SHE’S A PHILANTHROPIST TOO

Inspired by trips abroad, she founded Faces of Kibera, a nonprofit that helps Kenyan orphans.

5 ROONEY IS ACTUALLY HER MIDDLE NAME

“I never felt like a Tricia,” she has said of her legal first name, Patricia. “Rooney is more memorable.”

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