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Fashion star Zac Posen celebrates his 28th birthday today. Actor Kevin Kline is 61. Law & Order's B.D. Wong is 48. R&B singer Monica is turning 28. Shenae Grimes of 90210 is 19. Your favorite bisexual MTV personality, Tila Tequila, is 27. And Russian billionaire Roman Abramovich celebrates his 42nd birthday today. Weekend birthdays after the jump.

On Saturday: Mets pitcher Pedro Martinez will turn 37. Schools Chancellor Joel Klein will be 62. Violinist Midori will be 37. Adam Goldberg will turn 38. Katy Pery will be 24. And Ciara will be 23.

On Sunday: Hillary Clinton will turn 61. Democratic strategist Jefrey Pollock will be 37. Novelist Marisha Pessl will celebrate her 31st. Times theater critic Ben Brantley will turn 54. Dylan McDermott turns 47. Keith Urban will turn 41. And Rita Wilson will turn 52.