It's been a rough few months for designer Rachel Roy what with her husband Damon Dash's money troubles, but today she really does have a reason to break open the Cristal. It's her 35th birthday. Others blowing out birthday candles today: Actor Chad Lowe is 41. David Zaslav, the CEO of Discovery Communications, is 49. Advertising bigshot Linda Kaplan Thaler is turning 58. And nutty British royal Princess Michael of Kent turns 64 today.