Celebs, chaos and Cyndi Lauper at Betsey Johnson

Cyndi Lauper performed to a packed house at the Betsey Johnson runway preshow Tuesday night.

“I've been a Betsey fan since 1980,” Lauper told the crowd. “So this is for you, Betsey,” she said, before performing her signature “Girls Just Wanna Have Fun.”

Lauper wore black tulle and had her hair in a messy updo. She danced around a glittery black and pink stage.

Celebs including Jonathan Cheban, Steve Madden and AnnaSophia Robb were in attendance at the rocking show.

“Real Housewives of New York City” star Aviva Drescher stood with her husband, Reid, during the Lauper concert, decked out in a long-sleeved animal print dress.

Outside, hundreds of guests stood furiously in line once Espace, the venue for the show, hit capacity.

Though the show staff tried to control the crowds, many guests grew angry once the fire marshal announced the staff could only allow one person in for each person who left the Hell's Kitchen hot spot.

Some speculated that the crowd showed up after the Betsey Johnson invite was posted online.

The chaos outside, however, did not alter the atmosphere inside during the wild runway show. Guests sung and danced to hits during the show, and following the runway looks, Johnson, who was celebrating her 70th birthday, danced and cartwheeled to 50 Cent's “In Da Club.” She also did a split onstage with her daughter, Lulu, and granddaughter.