What's going on with U2 at the moment? They seem to be going through a very generous phase of sharing the stage with their fans. Or maybe they just need to drum up some good publicity for the 'Innocence + Experience' tour. But that's just us being cynical.

On Monday night, they invited members of U2 tribute act Acrobat to play 'Desire' - and on Tuesday, they invited a young woman who played guitar to join the fray.

On the second night of their run at Toronto's Air Canada Centre, Bono and co. brought a young woman called Stephanie up on stage after she held up a sign in the crowd saying that she played guitar.

He then invited her to play The Edge's acoustic guitar and the band launched into 'Angel of Harlem', before an acoustic version of 'All I Want Is You'.

Watch the footage below: