Hilary Swank, Blair Husain and co-host Amy Sacco were on hand for the event, which benefited Free Arts NYC, a charity that provides underprivileged children with education in the arts.
The evening was a change of pace for Swank. "I rarely ever party," said the actress before heading to a VIP area for the show.
Duffy, meanwhile, had cause to celebrate. After her set, the chanteuse was invited to browse the merchandise in the otherwise abandoned store.
"I feel like the president," she said. "I'd like to get a pair of good fitting underwear."