NEW YORK — If the barometer of a designer's cool quotient is measured by the number of hipsters clamoring to get into the after party, then Marc Jacobs is still at the top. After his show Monday night, a horde of downtown twentysomethings, models and a few Marc-obsessed celebrities descended upon 24 Fifth Avenue for champagne and people-watching.

Helena Christensen congratulated Karen Elson on her runway turn — she's seven months pregnant and had the honor of opening the show. "I'm wearing Marc," said Elson, with her barely discernible bump camouflaged by a swishy black cocktail dress. "It's not specially made, though; it just fits, thank God."

Lily Cole, Tasha Tilberg, Daria Werbowy and Erin Wasson stopped by for a drink, while Rachel Bilson and Adam Brody hid in a corner. But the real stir was created by the official "friends of Marc," like Sofia Coppola, Anna Sui, Sonic Youth's Kim Gordon and Karen O, who took over a row of banquettes to chat amongst themselves. Brandon Davis, meanwhile, was stuck behind the velvet ropes.

"I'm Brandon Davis, I'm Brandon Davis," he chanted until they finally relented and let him through the door.

This season's Lil' Kim stand-ins came in the form of Dita Von Teese and Jenna Jameson, who posed for chummy pics with Jacobs.

"This year fashion week is not just about the partying for me, I'm really focusing on the clothes," proclaimed Jameson, who is more famous for not wearing any. Interestingly, the nascent fashion lover hadn't even been invited to the after party. Nor had she been at the catwalk show, which she decided was "enthralling" anyway. But who can blame her for crashing — Marc Jacobs is the perfect place for a celebrity in search of a photo op.

Speaking of which, Nicole Richie loved the show, proclaiming it "amazing." "It was like 'Sleeping Beauty,'" said the wee one, accompanied by her ever-present stylist, Rachel Zoe.