A COSTUMED KARL: At Roberto Cavalli's Halloween party at Cipriani 42 Wednesday night, one woman came as Josephine Baker in the famous banana skirt. Another came as Marie Antoinette. Julia Restoin Roitfeld was a leopard, Tinsley Mortimer was an angel and the designer himself showed up as Karl Lagerfeld. "I wanted to go as someone from the world of fashion," he said with a shrug, after directing a slew of well-wishers to kiss his hand, on which he wore a copy of the French couturier's fingerless glove. But if there'd been a prize for best costume, it would definitely have gone to Christine Schwarzman, the wife of private equity honcho Stephen Schwarzman. With her husband out of town on business, she came outfitted as Victoria Beckham, complete with a cardboard cutout of the former Spice Girl's soccer-playing hubby. "I got it on the Internet for $70," she said. "He's really good in bed. Although it's always vertical or horizontal with him."

SINGING FOR SUPPER: Lenny Kravitz rocked Cipriani Wall Street Tuesday night at the Cipriani Wall Street Concert Series benefiting UNICEF and The Sarah Ferguson Foundation. Sean "Diddy" Combs, Jeff Gordon, Roberto Cavalli, Russell Simmons, Damon Dash and Giuseppe Cipriani were all in attendance, which was hosted by Lucy Liu, who's served as an ambassador for UNICEF the past four years. A native New Yorker, Liu has been busy filming in the city for her new ABC series "Cashmere Mafia," as well as three films, including "Watching the Detectives" with Cillian Murphy, a romantic comedy scheduled to come out in time for Valentine's Day. Cavalli gave Kravitz high marks as a designer. "He's a real talent. I think he could help me design something," he joked. Not only is Kravitz busy in the design world, but the rocker is also opening a new lounge at the Miami Beach's Delano with Art Basel Miami Beach and working on the upcoming February release of his album "It Is Time for a Love Revolution." "It's about us, this world. It's time for a love revolution and time for us to step it up and spread more love," said Kravitz.Another project Kravitz is working on is his clothing line, which he plans on unveiling in the next year. "It's taking me a lot of time because I'm juggling music and film, but it's definitely going to happen," said Kravitz.