For bon vivants, Thursday night of fashion week always features the one-two punch of the Calvin Klein and Zac Posen after parties. Francisco Costa took over the Waverly Inn for a postshow dinner that drew the likes of Natalia Vodianova, Michael Stipe, Helena Christensen, Anouck Lepère, Camilla Al Fayed, Rachel Zoe, Astrid Muñoz, Craig McDean, Barry Schwartz and a cabal of editors. Costa was still on a high from his back-to-back shows that afternoon, even though the first one had a small hiccup when a model lost her shoe. "The second one was much better," he laughed. "Things went much smoother and were much less manic. Next time, I'll have the editors come to the later one."

Schwartz, who'd made his first appearance at a Calvin Klein show since he and Klein sold the company, was looking to milk the day for all it was worth. "I figured I may as well get a meal out of it, too," he joked.

After the hundred or so dinner guests supped on the restaurant's already-signature rocket salad and hearty steaks or salty salmon, the American set left in typical New York fashion — 10 minutes after the desserts were served. The klatch of European journos, seated in "Siberia," the back garden room, lingered on, however. Costa, along with Vodianova and Elizabeth Saltzman Walker and IMG honcho Chuck Bennett, repaired to the Rose Bar at the Gramercy Park Hotel, where Justin Portman, like any good monied Euro, was found swilling Stolichnaya straight from the bottle.

Uptown, Zac Posen's after party was held in a cavernous space on the ground floor and lower level of the Dream Hotel, where the designer was surrounded by Rachel Bilson, Alexandra Richards, Annabel Dexter-Jones, Mirabelle Marden and Melissa Bent.

Cassie, the R&B crooner, made a quick pit stop before heading off to perform a late-night gig. "The last time I went to fashion week, I was 15 and I was walking in shows," she said. But she doesn't exactly miss it: "I love being a singer." Posen seemed relieved to get a chance to unwind — even if he was exhausted. "I think I slept an hour and a half last night," he said, with a little roll of the eyes.