And why are birthdays such polarizing affairs? Did Jessica Simpson buy her own engagement ring? Did Britney's insanity make her parents fall back in love? Tuesday gossip is a toddler who keeps asking, "Why?"

Fashion Week queen bee Fern Mallis turns 61 today. The legendary Diana Ross turns 65. Nancy Pelosi is 69. Keira Knightley is celebrating her 24th. Steven Tyler is 61. Curtis Sliwa turns 55. Michael Imperioli is 43. Journalist Bob Woodward turns 66. Author Erica Jong is 67. Martin Short is 59. James Caan is turning 69.…