Zac Posen and his posse of party people kicked off a 24-hour shopping party last night while eager shoppers formed a long line down Eighth Avenue and around the corner of 34th Street.

Posen fans Ginnifer Goodwin, Maggie Gyllenhaal, Claire Danes, Selma Blair, Mena Suvari, Parker Posey, Michelle Trachtenberg, Theodora and Alexandra Richards, Kelly Bensimon and models Coco Rocha, Alek Wek and Sessliee Lopez turned up, mostly clad in the limited edition Zac Posen for Target collection, to support their friend and shop for more.

Guests were greeted by girls holding trays of masks, noise makers and other festive doo-dads and then were offered the chance to pose for instant pictures in front of a "party" backdrop. Cocktails were passed throughout the space, which is part of the New Yorker Hotel, while party guests shopped and enjoyed a performance from The Like, the band that starred in the short promotional film for the collection, directed by Gia Coppola.

While most appeared to be shopping for themselves with a few garments draped over their arms, there were a couple shoppers early on that literally picked up sections of clothing from the racks and headed to the check out. That explains why there's a decent amount of Zac Posen for Target already available on eBay.

If you are in New York, run – do not walk – to the Zac Posen for Target pop-up store at the corner of 34th Street and Eighth Avenue. This shop is open for only for 24 hours – until 11pm Friday, April 16 – and if you can't get your hands on the whole collection of Zac Posen for Target there, you'll have to wait until it hits the stores and Target.com on April 25.