Kristen Stewart was back to rehearsing for The Runaways yesterday, trying to discretely sneak a cigarette during a break. We've seen lots of her making her way to and from the set, as well as her new dramatic Joan Jett makeover. While Kristen has been acting since she was just a kid, she's most famous for her role as Bella in Twilight. It's a character that many people hold near and dear to their hearts, so it might be difficult to envision Kristen playing someone new. So, tell us — are you excited to see her in a new role?