Justin Timberlake Surprise Performance In NYC THE VIDEO

9/1/2011 7:14 AM PDT

Justin Timberlake ROCKS Surprise Show In NYC [Video]

Justin Timberlake
took a break from movies ... and "SNL" ... and relationship drama -- and finally got back to music last night!!!!!

JT rolled over to his Southern Hospitality restaurant in NYC -- grabbed the mic and put on an impromptu show while tons of crazy fans went nuts ... including Mr. and Mrs. Kim Kardashian.

Timberlake performed with the band FreeSol ... mostly playing the keyboard while the band rocked out some stuff from their new album -- though he did grab a guitar at one point and knocked out a pretty awesome rendition of "What Goes Around ... Comes Around."