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Billboard lists '21 Under 21, selected not only for their tender age but also for their potential to rule the pop culture zeitgeist over the next 12 months.'

1. Taylor Swift

2. Justin Bieber

3. Selena Gomez

4. Charice

5. Soulja Boy

6. Nick Jonas

7. Willow Smith

8. Demi Lovato

9. Greyson Chance

10. Miley Cyrus

11. Lex Lugar

12. Taylor Momson

13. Chris Colfer

14. Miranda Cosgrove

15. Diggy Simmons

16. Wondergirls

17. Never Shout Never

18. New Boyz

19. Nikki Yanofsky

20. Cody Simpson

21. Sean Kingston