What happens when a beloved womenswear designer and a hip denim brand get together? A jam-packed party, for one thing. It was cheek by jowl at the Hôtel de Crillon salon on Monday night, when Lanvin maestro Alber Elbaz celebrated his collaboration with Swedish company ACNE. Parisian A-listers, models in lashes of Lanvin pearls, and a transvestite or two jammed the dance floor as the interestingly named London DJ team Horse Meat Disco spun a vintage eighties set. The bow-tied man of the hour held court amid a sea of bare-chested cater-waiters, telling guests that the 28-piece collection goes way beyond button-fly jeans. "I wanted to do desirable denim, from raincoats to tuxedos, corsets and shrugs," Elbaz explained. Eva Mendes and Liv Tyler, meanwhile, professed their love for all things Lanvin. Gushing over a favorite draped pink dress, Tyler pronounced it "so comfortable I could sleep in it." Sounds like someone might have also found herself a new favorite pair of jeans.

—Tina Isaac

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