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Selena Gomez performs during Z100's Jingle Ball 2010 at Madison Square Garden. (Bryan Bedder/Getty Images) Dec 10, 2010

Contents: 1. Selena Gomez 2. Katy Perry 3. Emily Osment 4. Justin Bieber 5. Katy Perry performs 6. Michael Buble 7. Michael Buble 8. Katy Perry 9. Bobby Ray Simmons of B.o.B.and Bruno Mars 10. Selena Gomez 11. Selena Gomez performs 12. Selena Gomez 13. Selena Gomez performs 14. Katy Perry 15. Katy Perry performs 16. Musician Bruno Mars performs 17. Singer Michael Buble 18. DJ Pauly D 19. Hayley Williams 20. Singer Hayley Williams 21. Singer Travie McCoy 22. Singer Taio Cruz 23. Kim Kardashian speaks 24. Singer Jesse McCartney 25. Elvis Duran of Z100 and Kim Kardashian 26. Recording artist Jay Sean 27. Justin Bieber 28. Kim Kardashian 29. Singer Taio Cruz 30. Bobby Ray Simmons 31. Bruno Mars performs 32. Singer/actress Selena Gomez 33. Crowley Brothers 34. Singer Bruno Mars 35. Singer Hayley Williams of Paramore 36. Singer Taio Cruz 37. Singer Hayley Williams 38. Hayley Williams of Paramore 39. Singer Selena Gomez 40. Singer B.o.B. 41. Singer Selena Gomez 42. Singer Katy Perry 43. Singer Hayley Williams 44. Katy Perry 45. Singer Katy Perry 46. Singer Katy Perry performs 47. Singer Katy Perry 48. Katy Perry performs 49. Canadian singer Justin Bieber 50. Canadian singer Justin Bieber 51. Singer Enrique Iglesias 52. Singer Enrique Iglesias 53. Justin Bieber 54. Singer Jaden Smith 55. Enrique Iglesias performs 56. Enrique Iglesias with audience member 57. Justin Bieber 58. Emily Osmet 59. Justin Bieber and Jaden Smith 60. Justin Bieber 61. Justin Bieber and Sean Kingston 62. Enrique Iglesias performs 63. Hayley Williams of Paramore 64. Kim Kardashian 65. Justin Bieber 66. Justin Bieber performs 67. Mark Hoppus of Blink-182 68. Top photos: More galleries

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