No. 9: Greyson Chance
Birthdate: August 16, 1997 (age 13)
Why He's Hot: Anyone who can reinvent a hit by Lady Gaga deserves a close listen -- and when that person is just 12 years old, they deserve about 32 million close listens ... and counting. When now-teenage Oklahoma native Greyson Chance sang "Paparazzi" at his school talent show with the flair of someone who's been in the music game for years, he became a overnight viral phenom. A record deal quickly followed, and Chance now shares managers with none other than his idol, Gaga, and her own progenitor, Madonna. Look for Chance to make another big splash this fall, when he drops his rock-inspired debut album.