Mara wears a Valentino lace dress with sheer sleeves to the Roman premiere of Girl With the Dragon Tattoo on Jan. 9. Tiziana Fabi / Getty Images Mara stuns in a Michael Kors dress with black Nicholas Kirkwood heels to the German premiere of Dragon Tattoo in Berlin on Jan. 5. Gero Breloer / AP Photo Mara poses in head-to-toe Miu Miu at a photo call for Dragon Tattoo in Berlin earlier that day. Gero Breloer / AP Photo Mara attends the film’s Spanish premiere on Jan. 4 in a white and black Rodarte dotted silk chiffon gown with black bow details and Givenchy shoes. Carlos Alvarez / Getty Images Mara looks sleek in a Givenchy patchwork blazer and black Louis Vuitton heels while posing for a photo call Jan. 4 in Madrid. Paul White / AP Photo Mara walks the red carpet in this Louis Vuitton Pre-Fall black dress at the premiere in Paris on Jan. 3. Jacques Brinon / AP Photo NEW YORK, NY - DECEMBER 19: Actress Rooney Mara and host Jimmy Fallon visit "Late Night With Jimmy Fallon" at Rockefeller Center on December 19, 2011 in New York City. (Photo by Jason Kempin/NBCUniversal/Getty Images) Jason Kempin, NBCUniversal / Getty Images At the New York City premiere of Dragon Tattoo on Dec. 14, Mara wears a black Prabal Gurung dress with Christian Louboutin heels and a Fred Leighton ring. Larry Busacca / Getty Images Mara arrives for the world premiere of Dragon Tattoo in London on Dec. 12 in a white cut-out Givenchy gown and Brian Atwood sandals. Joel Ryan / AP Photo Mara wears a nude Calvin Klein Spring 2012 slip dress at the eighth annual CFDA/Vogue Fashion Fund Awards on Nov. 14 in New York. D Dipasupil / Getty Images