It's a big day for Jewish fashion designers from the outer boroughs, clearly: Brooklyn native Isaac Mizrahi turns 48 today; meanwhile, the Bronx's very own Ralph Lauren is turning 70. Others celebrating today: Usher is turning 31. Yankees manager Joe Girardi turns 45. Actor Roger Moore is 82. Marc Jacobs' longtime business partner, Robert Duffy, is turning 55. Natalie Maines of the Dixie Chicks is 35. Czech model Daniela Pestova is 39. Sports radio host Jim Rome is turning 45. Writer Katha Pollitt turns 60. Wrestler/actress Stacy Keibler is 30. And Madonna's daughter, Lourdes Leon, who looks like she's turning 21, is actually turning 13 today.