Actor Ella Purnell grew up too fast: "You shouldn't really have to ask yourself about your career and your taxes when you’re 15," jokes the 28-year-old Brit. She landed her first film at just 13, playing the young Keira Knightley in the sci-fi "Never Let Me Go." From there, Purnell quickly gained recognition as the child star who could pull off action-packed features in "Kick-Ass 2" or enchant the screen with roles with fantasy films "Miss Peregrine's Home for Peculiar Children." But it wasn’t