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…

It's a special day for two important men in the fashion biz: Ralph Lauren is 69 and Isaac Mizrahi is 47. Also celebrating today: Yankees manager Joe Girardi is 44. Marc Jacobs' longtime business partner Robert Duffy is turning 54. Feminist writer Katha Pollitt is 59. Dixie Chicks singer Natalie Maines turns 34. Usher…