Lady Gaga Performs With U2

U2 are amidst their eight-night residency at Madison Square Garden but Sunday night's show was extra special with Lady Gaga joining the band on stage to perform 'Ordinary Love.'

The track was originally featured in the 2013 film, 'Mandela: Long Walk To Freedom.' 

Gaga is just one of the many celebrity guest stars who dropped by U2’s week of New York shows. Sir Paul McCartney, Nile Rodgers, Alicia Keys, Jon Bon Jovi, The Roots and Jimmy Fallon have all joined the band on stage.