The Runaways hits theaters in just a few weeks, but I'm already getting inspired by the band's rocker-girl look: smoky eye shadow, black eyeliner, and a devil-may-care attitude. Robin Mathews, the film's makeup department head, worked with Make Up For Ever cosmetics to transform Kristen Stewart and Dakota Fanning into Joan Jett and Cherie Currie. We caught up with her to find out the on-set beauty secrets. For Mathews's behind-the-scenes scoop — including the truth about whether Kristen really slept in her makeup for the part — just read more.