Chloe Moretz, better known as Joseph Gordon-Levitt's precocious little sister in "(500) Days of Summer." This year she'll not only enter her teens, but release three diverse, highly anticipated movies: The superhero action film "Kick-Ass," the kid-friendly adaptation of the best-selling "Diary of a Wimpy Kid" series, and the vampire-in-love drama "Let Me In."
On the big screen, she's about to break out as a badass assassin. In real life, her bedtime is 9:30 and she has to refer to the movie as "Kick-Butt" around her parents.