Kelly Clarkson channeled her inner rock goddess Monday night at a private acoustic concert at HUB 51 in Chicago.
The American Idol alum was offered a shot on stage by a fan in the audience and dispelling any ideas about her being a clean living good girl she was quick to accept.
Kelly downed the shot in one, exclaiming, "Oh, Sh**!" Going on to claim that her mouth was on fire and that, "You can't force the willing!"
But ever the pro Kelly didn't let the shot interfere with her set. An eyewitness tells RadarOnline.com that Kelly was "awesome" and did an "amazing performance".