Francisco Costa with fashion editor extraordinaire Camilla Nickerson. Photo: Clint Spaulding,

"It's Fashion's Night In -- in Calvin Klein!" enthused creative director Francisco Costa at the label's white-walled minimalist Madison Avenue temple on the evening otherwise know as Fashion's Night Out.

A crowd including "Sex and the City" star Cynthia Nixon, Bravo's Andy Cohen, Broadway big Cheyenne Jackson, and Kelly "the second ex Mrs. Calvin" Klein had gathered for a performance by rocker-photographer Bryan Adams, whose "American Women" portrait series hung on the walls.

"It's bringing people off the streets, and it's fun. But it's more than fun, it's a genuine effort to make fashion important in New York City," said Costa of Fashion's Night Out.

"And Bryan has been amazing. The first collaboration we had with him was with Fashion Rocks, the first time we did it in London, maybe six years ago. And then we discovered he's also a very talented photographer, so we did this amazing book with him."

The tome features Nixon and Vogue's Tonne Goodman, also present, plus other iconic women dressed in Calvin Klein, such as Julianne Moore, Scarlett Johansson, Lauren Bush, and Hillary Clinton. Proceeds from prints sold at the store benefit the NYC AIDS Fund.

Costa said he was going straight from the store back to his design studio, to keep working on his Spring 2011 collection. Asked what to expect from the Sept. 16 show, he protested that it was "too soon" to say anything. But with a bit of prodding, he allowed: "It's a definite comeback to a much more minimal form, luxury fabrics, and the silhouette is slimmer, much slimmer."

But isn't the Calvin Klein silhouette pretty slim to begin with?

"So?" he said with a mischievous grin. "We're going to push it much further!"

You heard the man, fashion fans: Put down that carrot stick!

StyleList is your source for New York Fashion Week. Read our runway reviews and backstage beauty reports. Gawk at fashionable celebrities. Watch our video interviews with style personalities. Ruminate on it all with our roundups of Spring 2011 trends.