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Zosia Mamet
Mamet saw her profile rise with roles in the Oscar-nominated "The Kids Are All Right" (2010) and the indie hit "Greenberg" (2010), as well as a recurring part on "The United States of Tara" (Showtime, 2009-2011) as Courtney, the supportive-turned-controlling would-be girlfriend of Tara's (Toni Collette) gay son Marshall (Keir Gilchrist). The actress continued to demonstrate her impressive talent in recurring roles on "Parenthood" (NBC, 2010-15) as Kelsey, a privileged friend of Amber's (Mae Whitman) and on "Mad Men" (AMC, 2007-15) as Joyce Ramsey, a lesbian photo editor at Life magazine who expands Peggy's (Elisabeth Moss) horizons. She earned her highest-profile role thus far when she was cast in the Lena Dunham/Judd Apatow collaboration, "Girls" (HBO, 2012-) as Shoshanna Shapiro, the bubbly suburban cousin of Jessa Johansson (Jemima Kirke) whose seeming naiveté about New York City life masked a surprising amount of wisdom.By Jonathan Riggs