All about Rihanna! Ranked No 1 pop star of the decade by Billboard Mag

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 - 20 when you continue...

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