CHARGE IT: For retailers and editors, fashion week is a job. But for the celebs on the scene, it's just another chance to shop. Victoria Beckham, for one, eyed the surrealist dresses at Marc Jacobs Monday night, perhaps coming up with a wish list to give her husband, David. "I buy him clothes, he buys me clothes, we help each other out," she said. Earlier that day, Beckham browsed Bergdorf Goodman, stopping at BG for lunch and then hours later for coffee with her pals and security detail. Beckham, who also was at Oscar de la Renta, flew back to Los Angeles Wednesday after meeting with retailers and manufacturers about her own fashion line, DVB.