Foo Fighters were joined by classic rocker Joan Jett at one of their concerts earlier this week and it went so well they decided to go for seconds on 'The Late Show with David Letterman.'

Foo Fighters fans sometimes get a little extra during their concerts -- on their latest tour it has not been unusual for members of rock royalty to join them on stage. The crowd at the band's Madison Square Garden gig Sunday night were treated to a few bonuses as the Foo played well past the venue's 11P curfew and were joined by Husker Du frontman Bob Mould and Joan Jett. Together Joan and the Foo performed her Blackhearts' hit 'Bad Reputation,' with Dave Grohl lending backup vocals and guitar while Jett took the lead.

The band had such a blast playing as The Blackhearts, they decided to repeat the pairing for their appearance during last night's 'The Late Show with David Letterman.' This marks the third time in recent memory where the Foo have appeared on television with a special guest -- the most recent being their cover of 'In the Flesh' with Roger Waters during Pink Floyd week on 'Late Night with Jimmy Fallon,' which was preceded by their 'Conan' performance of 'Dear Rosemary' with Bob Mould.