On Wednesday afternoon, Justin Timberlake tweeted an invitation for fans to join him later that evening at New York City's Southern Hospitality barbecue restaurant for some "live music."  And he did not disappoint -- People magazine reports that JT gave a free impromptu 45-minute concert around 11 p.m. at the eatery.   According to People, Justin took the stage with FreeSol, the hip-hop band that's signed to his record label, and performed a few numbers, including an a cappella version of "What Goes Around...Comes Around."

Among the famous faces checking out the show: newlyweds Kim Kardashian and Kris Humphries, and Amanda Seyfried, star of JT's next movie, In Time.  Justin plans to take the stage again on Thursday night for a free concert with FreeSol at New York City's Irving Plaza.

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