“You know, I’ve never drunk vodka in my life,” Diane von Furstenberg confessed Sunday night at Caviar Kaspia, hoisting a tiny glass. She was the toast of Paris on the eve of couture as Vanity Fair editor in chief Graydon Carter hosted a soiree in her honor, to announce the April opening of her Paris boutique, which will be tucked on Rue d’Alger behind Helmut Lang’s shop. “It’s about time,” declared Marisa Berenson, flashing a crystal-studded black DVF wrap dress under her fur. “Only Diane could pull in a crowd this chic,” said Carter, wearing a black velvet smoking jacket and puffing up a storm in nicotine-friendly Paris. Surveying a crowd that included the likes of Barry Diller, Jeanne Moreau, Kristen Scott Thomas, Roman Polanski, Anouk Aimée, Betty Catroux, Lee Radzwill, Valentino, Hedi Slimane and Yves Saint Laurent, Giancarlo Giammetti pulled out a credit-card sized digital camera and started snapping. Turns out he’s planning to publish a book of photography next year. The working title: “Vanity.” “But not Vanity Fair,” he clarified. Documenting the fashion world since the Seventies, Giammetti has more than 1,000 photo albums to select from. And there were plenty of new photo-ops that night: L’Wren Scott, at “bosom buddy” level, towering on six-inch Christian Louboutin heels and in a plunging black dress; Loulou de la Falaise and Georgina Brandolini comparing notes on their fledgling businesses; and Elizabeth Saltzman, not a big fan of Russian fare, drizzling Canadian maple syrup on her blinis.