With Taylor Swift out of the running -- she celebrated her 21st on Dec. 13 -- it's tooth and nail between these young music stars to be among those on our list of 21 Under 21. Some of these youngsters are just finding their musical voice, while others (ahem, Bieber) are hotter than ever.
Selena Gomez
Why She's Hot: Selena Gomez & the Scene beat Justin Bieber for Favorite Breakout Artist at the People's Choice Awards.
What's Up Next: The band's first full-production road project, the 'A Year Without Rain Tour' 2011.
Essential Listening: 'A Year Without Rain'
Selena Gomez
Age: 18
Selena Gomez is not just 'some Disney star' -- the actress/musician started Selena Gomez & the Scene, a pop band for which she is lead singer, in 2008.
Why She's Hot: Selena Gomez & the Scene beat Justin Bieber for Favorite Breakout Artist at the People's Choice Awards.
What's Up Next: The band's first full-production road project, the 'A Year Without Rain Tour' 2011.
Essential Listening: 'A Year Without Rain'