Cruise attended his 17-year-old son Conor's gig with a group of friends and was seen enjoying as his son played to the crowd, reported Sun Onlie.
As he reached the venue, the actor ordered staff to strip the DJ booth of alcohol at London's Chinawhite before Connor started his set.
And when the youngster got into full flow behind the decks, Cruise was tapping his feet while chatting to a couple of Playboy bunnie.
"Tom came over and just started chatting to us. He was really friendly. We're good friends with Connor from LA but we didn't expect his dad to turn up