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.

PHOTOS: Kelly Clarkson Wows At VH1 Divas

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!"

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• American Idol
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• HUB51
• Kelly Clarkson
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