Happy birthday, Zosia Mamet—the actress turns 27 today! While best known for her portrayal of Shoshanna Shapiro on HBO's Girls, Mamet has been acting for more than a decade, with notable appearances on Mad Men, United States of Tara, and Parenthood. This year, aside from providing comedic relief on the fourth season of Girls, you can catch the actress in Dominion alongside Rhys Ifans and John Malkovich. She's also staged to make a breakthrough musically, with her band Chacha's first single out later this year. Most importantly, though—what color will she dye her hair next? In honor of her birthday, and her unpredictable style, take a look at the actress and her many ’dos through the years.