Molly Sims, Kelly Osbourne, and Jessica Szohr all wear Marchesa to the designer's Spring/Summer 2011 presentation. Photos: Theo Wargo, WireImage for Marchesa | Courtesy of Marchesa

West 22nd Street in New York City was a mob scene the afternoon of Sept. 15 as celebrity after celebrity stepped out of limousines wearing Marchesa, in honor of the label's stunning Spring/Summer 2011 presentation.

Molly Sims showed off her mile-long legs in a beaded minidress from an earlier collection, while "Gossip Girl"'s Jessica Szohr was gorgeous in a silver metallic number from the new season.

"Yes, it's Marchesa!" she said, spinning around to show StyleList. "I kind of tried on a couple of different ones to come today to support Marchesa because I'm a huge fan. I want to live, eat, and breathe in this dress because I never want to take it off. I'd wear this to a premiere or a great dinner party, or to Fashion Week!"

called Marchesa an "amazing collection," adding, "I also thought Rag & Bone was awesome. So now I have to go shopping and create my closet for the new season! There's a lot of chains and sequins and lace going on with [different designs], so I'm excited for that."

"This is my favorite dress of the week," Kelly Osbourne told us of her ethereal Marchesa cocktail frock. "It's like somebody has taken a cloud and wrapped it around me and belted it. It feels amazing!"

One half of the Marchesa design team, Keren Craig, said that her inspiration for prints in the collection was "painters from the Oriental period."

Her daughter Delilah, barely one year old, looked on nearby as the designer posed with celebrities including Gabourey Sidibe (who wore Marchesa to the Oscars this year), Matchbox Twenty's Rob Thomas and wife Marisol Maldonado, and rival socialites Tinsley Mortimer and Olivia Palermo, who managed to ignore each other while standing two inches apart.

"I don't know whether it changes your aesthetic, but it definitely changes you as a person, having a child," Craig told StyleList. "It's been great. "Georgina [Chapman, her co-designer] literally gave birth two weeks ago. She's unbelievable, she's just amazing!"

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.