EntertainmentTeen Takeover! The Year's Hottest (and Youngest) Stars

MILEY CYRUS

Age: 16
The undisputed teen queen – estimated to be worth $1 billion by the time she turns 20 – has another season of her star-making Disney hit Hannah Montana on the way and is branching out with a new non-Hannah movie deal. "Madonna always reinvents herself, and that's what I want to do," says Cyrus, who broke records with this summer's Hannah Montana & Miley Cyrus: Best of Both Worlds concert movie.