I just died of happiness.

On Letterman Tuesday night, the Foo Fighters came on and performed 'Bad Reputation' with the rock queen herself, Joan Jett! (Sidenote, did you know she's 53 years old?! I know it blew my mind when I read it too!)

And on Sunday the Foo Fighters played a show at Madison Square Garden, where Jett came out as a surprise guest. Shoot! Why wasn't I there?!

Either way, they did a pretty straightforeward run through of the song 'Bad Reputation' with Dave Grohl taking over lead vocals for the second verse.

So without further adieu here it is, the Foo Fighters and Joan Jett performing her 1989 hit 'Bad Reputation'