Rock took the stage with Rage Against the Machine star Tim Commerford at Malibu's Cafe Habana and entertained the crowd by belting out a string of hits by the likes of Metallica, the Sex Pistols and Led Zeppelin during the venue's weekly karaoke party.

But they weren't the only performers in the house - McEnroe also took part in the sing-a-long.

A source tells the New York Post's Page Six column, ""McEnroe joined in on many of the songs, they sang 'til closing.""