Lady Gaga took to the stage wearing a blonde wig which she teamed with black wardrobe and a pair of bizarre high heels. She gave Bono a big hug before playing the piano and sang some of the track's lyrics alongside the band's frontman.
After the show, U2 shared on Instagram a photograph of the band members performing with Lady Gaga.
Ordinary love is U2's contribution to the soundtrack of the 2013 Nelson Mandela biopic Mandela: Long Walk to Freedom. The song was nominated for the Best Original Song Award at last year's Oscars, but lost to Idina Menzel's Let It Go from the Disney blockbuster Frozen.