Patrons of a karaoke bar in Michigan got the unexpected surprise performance of a lifetime when Gerard Butler, Demi Moore and Michelle Monaghan took time out from shooting their latest films to belt out ACDC's "You Shook Me All Night Long" the other night.
While it's obvious everyone at Rockstarz Karaoke Bar & Grill had a blast, it's also safe to say Gerard and crew will most likely hold on to their day jobs.
Gerard Butler to Demi: 'You Shook Me All Night Long'
7/24/2010 4:05 AM PDT BY TMZ STAFF
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