ROLLICK AT THE RITZ: “I’ve been bitten,” shrieked Dior fine jewelry designer Victoire de Castellane, gazing at two bloody fang marks above her heart. “Somebody find the vampire!” The culprit could have been any of the bloodthirsty, vamped-up merrymakers at the Fiancee of the Vampire Ball Castellane hosted on Monday at the Ritz to celebrate the opening of her fine jewelry boutique on the Place Vendome.

Among those swept up in the party’s vicious vibe was LVMH fashion boss Yves Carcelle, who sported a pair of formidable plastic fangs. “I’ve a victim,” he warned, swooping toward his wife, Rebecca. “Help,” she giggled as Carcelle lingered over her neck. Meanwhile, as hundreds of revelers tore up the dance floor, others chatted over champagne in the hotel’s ornate salons. Holding court in the VIP sanctum, Bernard Arnault welcomed the likes of Claudia Schiffer and Valentino. “I love the party’s spirit,” said the Italian designer, devilishly dapper in a blood-red jacket. “It may not look it, but this coat is 30 years old; I thought it was perfect for tonight.”

STRICTLY BALLROOM: Karl Lagerfeld has been moonlighting — at a dance academy. After finishing with fittings for their respective collections, Lagerfeld, Amanda Harlech and Hedi Slimane and others have been taking dance lessons at an old academy in Paris, the same one Lagerfeld went to when he was 18. It was all in preparation for a private party Tuesday night in honor of Glenda Bailey and the new team at Harper’s Bazaar. Lagerfeld cleared the furniture out of his main-floor sitting room and turned it into a dance hall for the event.

SELL PHONES: Nokia unveiled a new bauble for the couture crowd: a $21,000 cell phone encased in platinum with a hot button linked to a concierge who can make dinner or hotel reservations. At a glitzy press conference and party here on Monday night, Vertu, Nokia’s new luxury subsidiary, invited journalists, bankers and the ubiquitous Gwyneth Paltrow to hear its stereo-quality ring tone and feel the rich leather trim. The platinum phone is expected to reach stores at mid-year, with lower-priced versions in gold or stainless steel to follow. Gloved demonstrators cradled the phones like pieces of diamond jewelry and fielded questions such as: “What if I drop it?” or “Are you giving these out at the end of the party?” Chloe designer Phoebe Philo, just back from vacation in Rajasthan, India, was enjoying the loungey atmosphere until her cell phone rang, and she had to talk the studio through a minor emergency. Sometimes a silent phone is a virtue.

MARNI ON MONTAIGNE: “I thought this shop should be a bit more chic than the others,” said Consuelo Castiglioni at a cocktail party for Marni’s first boutique in the City of Light, which is on the Avenue Montaigne. “I mean, this is Paris. So we really kept the store polished and clean.” The new space was designed by Future Systems, the London-based architecture and design practice, from a template they used for the firm’s shops in London and Milan. The Paris store, the company’s third and largest, reprises the sinuous chrome racks and sculptural space used in the others, but instead of pink or blue it is stark white. Next month, Castiglioni added, Marni will unveil a shop in New York on Mercer Street and one in Tokyo in April. “It’s exciting,” she said. “We’re really on a roll.”