Gerard Butler: Karaoke with Demi Moore!

Gerard Butler and pal Demi Moore jump on stage and belt out some karaoke songs at Rockstarz Karaoke Bar on Saturday (July 17) in Garden City, Michigan.

The pair joined actress Michelle Monaghan on stage and performed hits like ACDC‘s “You Shook Me All Night Long.”

Gerry and Michelle have been filming Machine Gun Preacher in the Detroit area, while Demi is in town for her movie, LOL: Laughing Out Loud.