Kevin Mazur/Getty Images; 901 Tequila
Justin Timberlake surprised an entire Sin City club with free shots last night!
The singer is in town for business at the Magic fashion trade show for his William Rast line, but made time for pleasure, too.
Monday night, he threw a private dinner party at Lavo in the Palazzo where girlfriend Jessica Biel and business partner Trace Ayala were in attendance.
After the group finished eating, J.T. headed into the main club to make an unannounced appearance.
"People were freaking out," a source tells E! News.
At exactly 1:09 a.m., Justin got on the microphone...So what did he have to say?