Celebrating birthdays today: Real estate broker Deborah Grubman—who also happens to be the wife of Allen and stepmom of Lizzie—turns 56. Party planner extraordinaire David Monn is 45. Designer John Varvatos turns 54. Dustin Hoffman is 71. Two former boy band-ers, Drew Lachey and JC Chasez, both turn 32 today. Tennis star Roger Federer is 27. And Robin Quivers is 56. Saturday is the big day for Chris Cuomo (left) who will be celebrating his 37th. Michael Kors will be turning 49. Allure's Linda Wells will be 50. And real estate broker Larry Kaiser and designer Peter Marino will be a year older on Saturday, too. On Sunday: Fashion icon Betsey Johnson will be 66, actress Angie Harmon will be 36, and real estate developer Harry Macklowe will turn 71.