This was probably the first time the ladies-who-lunch shopping mecca has hosted a mosh pit!
Sending shoppers into a frenzy was a quartet of white-hot celebs: Mary J. Blige, Sarah Jessica Parker, Victoria Beckham, and Nicole Richie.
Bergdorf's hosted more than half a dozen special events throughout the evening. Guests rode the escalators from a Trish McEvoy beauty consultation to a dog fashion show to a karaoke fest hosted by tireless party photographer Patrick McMullan.
Designers in attendance included Narcisco Rodriguez, Cynthia Rowley, Jason Wu, Catherine Malandrino, stiletto star Guiseppe Zanotti, and handbag maestro Carlos Falchi.
Mark Badgley and James Mischka carried their dogs, which were dressed like Fred Astaire and Ginger Rogers.
Rowley rocked perhaps the most unusual accessory: a white helmet tucked under her arm.
That helmet would have come in handy when swarms of guests spotted Beckham and rushed the designer (and world's most famous soccer wife). She looked quite modest in a black, off-the-shoulder sheath.
A photo studio drew hordes of fans to pose with A-listers like Richie and Ms. "Project Runway" (and just-christened makeup maven) Heidi Klum. Richie then popped up at the karaoke party, inviting a handful of guests to join her at the mic for the Spice Girls' "Wannabe."
Blige, meanwhile, demonstrated the power of her new sunglasses line while facing a mob of blazing flashbulbs. The singer and entrepreneur wore a dark jacket over a formfitting dress, plus large gold hoop earrings.
Black lace was a big trend among the A-listers. Both (a very blonde) Richie and Rowley wore inky lace minidresses. SJP rocked nosebleed-high shoes with dark lace inserts.
Long lines of hopefuls snaked across the building's front, waiting to enter while watching live artists in the store's legendary windows. There were plenty of distractions, such as burlesque by the World Famous Pontani Sisters and music by cabaret singer Joey Arias.
Even some of the special guests had difficulty getting in. While waiting to cross the VIP velvet rope, bridal and eveningwear designer Monique Lhuillier told StyleList what she would buy if she had a chance during the busy night. "Shoes!" she exclaimed, "I can't get enough shoes."
But with such a spectacle, was anyone actually shopping? Fern Mallis, the longtime captain of the Fashion Week ship, was skeptical. "This is like Halloween for grown-ups!" she laughed. "Who can look at clothes with everything that's going on?"
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.