No. 21: Sean Kingston 
Birthday: February 3, 1990 (age 20)
Why He's Hot: A rapper at heart, Sean Kingston (real name Kisean Anderson) initially charmed music fans with the reggae-pop vocals on his breakthrough hit "Beautiful Girls." The song stayed at no. 1 on the Billboard Hot 100 for four weeks in 2007 and also enticed Beyonce  to book Kingston as her tour's opening act. The Miami native matured his sound on his dancefloor-ready top 5 2009 single "Fire Burning," and what's next will heat up the charts as well. Kingston's mixtape with Justin Bieber , "Our World," will be released later this fall, while Kingston has released two hit singles, "Letting Go (Dutty Love)" and "Dumb Love," from his upcoming album, which should hit shelves in early 2011.
Video Below: Sean chats with Billboard.com in 2009
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