5. Earl Sweatshirt: 21 Under 21 (2013)

Earl Sweatshirt

Last Year's Rank: 9

Birthdate: February 24, 1994 (Age 19)

Why He's Hot: After returning from his Samoa-based boarding school in February 2012, Earl Sweatshirt hit the ground running. Within one year of his return, the L.A.-based rapper laced his sophomore album, "Doris," and partnered with Columbia Records to create his own record label imprint, Tan Cressida. "Doris" debuted at No. 5 on the Billboard 200 with 49,000 sold according to Nielsen SoundScan. Earl Sweatshirt is currently on tour in support of "Doris."