Justin Timberlake was a friend with major benefits to New York City residents last night, as the singer took to the stage for an impromptu concert.

After Tweeting that he'd be performing at the barbecue restaurant Southern Hospitality in Hell's Kitchen at 11 p.m., JT grabbed his guitar and joined the band FreeSol on a 45-minute set that was witnessed by a packed house, one that included Kim Kardashian and Amanda Seyfried.

Timberlake treated attendees to a rap ballad titled "Don't Give It Away," along with an a capella performance of "What Goes Around... Comes Around."

He also hyped another performance tonight at New York's Irving Plaza. It will, once again, include himself and FreeSol, whose album is out on JT's Tennman Records label. We just lost our entire Big Apple reader base for the day, didn't we?

Enjoy the show, folks!

[Photo: WENN.com]