GEM OF A CROWD: Sunshine, jewelry and City Bakery goodies lured Amber Valletta, Andie MacDowell and Jamie Tisch, channeling Lance Armstrong in yellow biking gear, to tea Thursday at Ilene Resnick's Brentwood home. Christine Greene, whose flower-inspired necklaces, bracelets and earrings range from $1,500 to $8,000 at jewelry mecca Kaviar and Kind, showed off her latest hammered 18-karat yellow and white gold bangles to the receptive audience. "I am a girl. I think it's in my genes," said Valletta, wearing vintage Ossie Clark, of her jewelry habit. "I will wear blue jeans and a nothing shirt and have on a great pair of earrings." Longtime pals Valletta and Greene, whose kids attended the same preschool, planned to whip up tasty morsels for the gathering, but abandoned the kitchen last minute in favor of a catered affair. "We're Aquarians, so we blamed it on that," Greene joked.