Rooney and Kate Mara
Who they are: Both TV and film actresses, Kate and her younger sister, Rooney, are equal parts incredibly talented and impeccably chic. Kate has been on the small screen in House of Cards and in films like Brokeback Mountain and 127 Hours. Rooney is best known for her roles in The Social Network and as Lisbeth Salander in the big-screen adaptation of The Girl With the Dragon Tattoo.
Rooney's now-infamous transformation from sweet girl-next-door to a tattooed, pierced punk solidified her place in the fashion industry. Then Calvin Klein designer Francisco Costa was inspired by her look for the brand's Fall 2012 collection, sending models down the runway with dark hair, pale skin, and black sheath dresses. Kate's style, on the other hand, is a bit more light-hearted but still stylish nonetheless. She even told us in early 2012 that she and her little sister share lots of clothes and shoes since they're "relatively the same size."