London, July 25 (IANS) Partygoers at a karaoke bar in Michigan were treated to an impromptu performance when Hollywood stars Gerard Butler, Demi Moore and Michelle Monaghn took to the stage to sing.

The trio managed to take time off from their busy filming schedules for a night out and headed to the Rockstarz Karaoke Bar & Grill in Garden City where they stunned patrons with a performance of AC DC's classic hit 'You Shook Me All Night Long', reports tmz.com.

Footage of the rendition has also surfaced online.