Taylor Momsen Had Sebastian From NYC Prep to Her Birthday Party

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Momsen performing at her party. Photo: Getty Images

Worlds collided at Taylor Momsen's Sweet Sixteen last night when NYC Prep's Sebastian rubbed shoulders with the man who plays his fictional counterpart, Chace Crawford. Sebastian, blonde locks aflutter, had just come from PC Peterson's charity event. "He's a really nice guy, actually, despite what he may come off as on the show," Sebastian said of his world-weary co-star. The whole cast has bonded since wrapping, according to Sebastian. "We all know each other better [now]." And the Kelli-Taylor love triangle? "It was just fun." But then another wall came down: Sebastian reads the recaps! "Is that the one that picks a winner?" he checked. Yep — and we reminded him that he even took home the honor once. "I'm very proud," he said. "But I'm a little pissed off, actually, because Cole is always the 'auxiliary winner.'"

Elsewhere at the party, the MisShapes spun for Momsen. Leigh Lezark, pin-thin and clad in black, said she knows Momsen from around. "She's very mature for her age," she explained. "I can't wait to play [the Ramones'] 'Sheena Is a Punk Rocker,' 'cause I think it'll work well for her." So how did Lezark turn 16? "I had a big party in my backyard. I'm pretty sure that was the year I broke my pool. It was like an above-ground pool and there were just too many people swimming around drunk and it just collapsed while we were still in it."

When Momsen took the stage with her band, the Pretty Reckless, co-stars Ed Westwick, Jessica Szohr, and Chace Crawford magically appeared in the front row to cheer her on. Momsen sang about "boys, manipulative boyfriends, and bad boyfriends," clad in a translucent pink slip, black bra showing. We asked Lezark if Momsen was indeed the most fabulous 15-year-old in New York, at least for a few more hours. "I don't know many others," she said.