Sizzlin' Pics: The Hottest 25 Stars Who Are 25 & Under!
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Justin Bieber (16)
What's He Done: Since being discovered in 2008 from his YouTube videos, teen dream Justin Bieber has rocked the world with his single "Baby" and albums My World and My World 2.0.
What's Next: Bieber will be appearing in the 3D documentary concert film 'Justin Bieber: Never Say Never,' released on Feb. 11, 2011.
