Katy Perry (1) - Week of Jul 3, 2010

Hosted by Maroon 5

Exits are unknown

Last week's #1 song: Ke$ha - Your Love is My Drug (1 week at #1)

45. Lady Gaga/Beyonce - Telephone (-28)

44. John Mayer/Taylor Swift - Half of My Heart (Debut)

43. Jay-Z/Mr. Hudson - Young Forever

42. Cartel - The Perfect Mistake

41. Shontelle - Impossible

40. We The Kings/Demi Lovato - We'll Be A Dream

39. Uncle Kracker/Kid Rock - Good To Be Me (Debut)

38. The Ready Set - Love Like Woe

37. Miranda Cosgrove - Kissin U

36. Glee Cast - Don't Stop Believin'

35. Jason Derulo - Ridin' Solo (-3)

34. Michael Bublé - Haven't Met You Yet

33. Miley Cyrus - Can't Be Tamed

32. Train - Hey, Soul Sister

31. Michael Franti & Spearhead/Lady Saw - Shake It (-4)

30. Theory Of A Deadman - All or Nothing

29. B.o.B./Rivers Cuomo - Magic

28. OneRepublic - Secrets

27. 3OH!3/Kesha - My First Kiss

26. Nickelback - This Afternoon (-6)

25. Justin Bieber - Somebody to Love

24. The Fratellis - Chelsea Dagger (Debut)

23. Mike Posner - Cooler Than Me

22. Apollo Drive - Papercut

21. Black Eyed Peas - Rock That Body

20. Green Day - Last of the American Girls (-4)

19. Travie McCoy/Bruno Mars - Billionaire

18. Maroon 5 - Misery (+22)

17. Usher/will.i.am - OMG

16. Mayday Parade - Kids in Love

15. Kesha - Tik Tok (+14)

14. Neon Trees - Animal

13. Eminem - Not Afraid

12. Paramore - The Only Exception

11. Timbaland/Katy Perry - If We Ever Meet Again (+3)

10. Train - If It's Love

9. Lady Gaga - Alejandro

8. A Rocket to the Moon - Like We Used To

7. Jason Derulo - In My Head

6. The Script - Breakeven

5. Taio Cruz/Ludacris - Break Your Heart (-3)

4. Scouting for Girls - This Ain't A Love Song

3. Kesha - Your Love is My Drug (-2) (1 week at #1)

2. B.o.B./Hayley Williams - Airplanes (+17)

1. Katy Perry - California Gurls (+2) (1 week at #1) [Hits 1 edited out Snoop Dogg...]