Mario Testino gave New Yorkers a peek at the inside of his London town house at the Tuesday-night opening of his show At Home at the Yvon Lambert gallery. The photographer-turned-curator patterned the exhibition after his Holland Park living room, complete with enormous works by Anselm Reyle, Wolfgang Tillmans, and Nicola Tyson. Books, magazines, and faxes were also strewn about to give the installation an authentic feel. "I like to hang everything together, salon-style," said Testino, in between greeting Vogue's Anna Wintour, Vanity Fair's Michael Roberts, and Marchesa's Georgina Chapman and Keren Craig. "The [art] is all mine; I've been collecting for a long, long time."

Afterward, the chic gang gathered at Ian Schrager's yet-to-open boîte Wakiya in the Gramercy Park Hotel. Sienna Miller breezed in Edie Sedgwick-style, wearing a short glittery shift by Stella McCartney and large vintage hoop earrings. Upon seeing the shutterbug, she broke out into her trademark megawatt grin. "We've been practically living together for the past week," she said, noting that they were in Rome together for a Vogue shoot and the Valentino anniversary. With that, the Peruvian began to rub the actress' flat stomach. "We're announcing our engagement," he said with a laugh. "This is Mario the fourth."