Top talent from the magazine such as editor-in-chief Robbie Myers and creative director Joe Zee mingled on the red carpet with celebrities like Padma Lakshmi, designers Diane von Furstenberg, Patricia Field, Catherine Malandrino, Phillip Lim, Thom Browne, Rachel Roy (who designs a jewelry collection with Estelle), and Vera Wang, as well as Katie Cassidy and Matthew Settle from "Gossip Girl."
"Halloween is my favorite holiday,' Lakshmi told us, looking anything but scary in a black and gold Naeem Khan gown and bracelets from her own Spring collection. "There's no cooking, no present-buying, and not so many relatives!"
Lakshmi said she hadn't yet decided on her costume for the weekend, although designer Peter Som told us: "I'm working a Kermit the Frog thing, but I'm afraid I'll scare people with the Ping-Pong eyes."
We asked whether he might go as Anna Wintour being carried by two bodyguards, as Tim Gunn infamously saw happen, setting off a feud with the Vogue editrix when he told the story.
"No comment!" Som said with a smile.
The evening, which was sponsored by retailer White House | Black Market, also launched the magazine's new book, "The Ellements of Style."
Editor-in-chief Myers told us of the first time she saw the magazine: "I was a magazine junkie and I remember seeing things in Elle and thinking, Wow, there are women in there that don't look at all like the other women in the other magazines. It was so sexy and cool and it was like dynamite went off in the fashion world. I'm so proud of the team around me."
Designer and former "Project Runway" winner Christian Siriano said of the magazine: "It's always young and fresh and inspiring. And they use a lot of new, young designer pieces. They're always showing who's on trend and who's up and coming, and they're so nice to work with!"
Asked about his Halloween costume plans, he wouldn't let on, but they seem to involve high heels, as in previous years.
"I haven't fallen yet, and hopefully, I won't fall this year. So, so far, so good," Siriano said with a grin.
In related news, check out Elle's November cover girls.