Billboard.com released this year's 21 Under 21 list consisting of some names from last year's list. There are a lot of newcomers, though. Has your favorite made it to the Billboard's list? Check it out below. Billboard's 21 "Under 21: Music's Hottest Minors 2011" is topped by Justin Bieber who was last year's number 2. And why is he hot? Here's what Billboard has to say: Why He's Hot: Any way you slice it, Justin Bieber is at the top of the underage set, and in 2011 he gracefully takes our 21 Under 21 crown from now-21-year-old Taylor Swift. Although the Biebs hasn't released a proper album since "My World 2.0" in March 2010, the pop superstar has spent the past year essentially releasing everything else imaginable: an acoustic album, a 3D movie, a memoir, a new fragrance, a singing doll, and a lock of his hair, which became a hot item on eBay. Next up is a Christmas release, an insanely anticipated new album, and more
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