14. Dakota Fanning
It's hard to believe all that Dakota Fanning has packed into her past 16 years! The past 12 months alone have been a whirlwind for the young star, after she scored a role in the coveted Twilight series. She teamed up with her pal Kristen Stewart again for The Runaways, in which both young actresses tackled mature topics. She's still in high school, but Dakota seems to have conquered that realm as well — she was crowned homecoming princess last Fall. Dakota's already thinking beyond senior year, as she was rumored to have recently visited colleges on the East Coast.