No.1 pop star of the decade by Billboard magazine goes to Rihanna

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Billboard ranked the hottest 100 pop stars of the decade based on sales, and Rihanna came out on top. She has the most chart appearances (34), the most top 10s (21) and the most no. 1 hits (9).

See the top 10 below...
1. Rihanna
2. P!nk
3. Britney Spears
4. Kelly Clarkson
5. Mariah Carey
6. Katy Perry
7. Usher
8. The Black Eyed Peas
9. Janet Jackson
10. Madonna
11. Lady Gaga
12. Christina Aguilera
13. Justin Timberlake
14. NickelBack
15. Match box twenty
16. Beyonce
17. Backstreet Boys
18. Jennifer Lopez
19. Maroon 5
20. Avril Lavigne

See the full list HERE