There’s just no stopping Lady GaGa. After conquering the airwaves with her successive chart-topping hits, including Poker Face, Just Dance and Bad Romance, the courageously outrageous performance artist has also conquered the social Web, taking the top spot in popular music site Last.fm, for its Best of 2009 chart.

Last.fm’s annual compilation, which lists the hottest artists of the year based on the number of scrobbles (or plays) made by users, crowned Lady GaGa, who garnered a total of 755,309 listeners and 18,487,195 scrobbles, as the site’s most popular artist of 2009. Indie rock band The Killers is at No. 2, followed by Lily Allen,  The Prodigy, Franz Ferdinand, Beyoncé, Animal Collective, Green Day, Yeah Yeah Yeahs and Kanye West rounding up the top 10. The No. 11-50 artists are listed below.

11. Britney Spears

12. Fall Out Boy

13. Taylor Swift

14. Muse

15. Black Eyed Peas

16. Phoenix

17. Paramore

18. Kelly Clarkson

19. Placebo

20. La Roux

21. Grizzly Bear

22. Arctic Monkeys

23. A Day to Remember

24. Röyksopp

25. Passion Pit

26. Bat for Lashes

27. The All-American Rejects

28. Nickelback

29. Guns N’ Roses

30. U2

31. Depeche Mode

32. Fever Ray

33. Eminem

34. The XX

35. Metric

36. The Fray

37. Regina Spektor

38. Kasabian

39. Florence + The Machine

40. Little Boots

41. Owl City

42. Mando Diao

43. The Decemberists

44. T.I.

45. Little Joy

46. Andrew Bird

47. Lamb of God

48. All Time Low

49. Enter Shikari

50. Carter Burwell