Noel Gallagher joined U2 on stage last night at the second of the band's shows in London's 02 Arena for a cover version of The Beatles' All You Need Is Love.
The former Oasis frontman also returned to the stage for the final encore of the night, I Still Haven't Found What I'm Looking For.
"I'd like to bring out of one my heroes, one of the band's heroes to help us out with this next song. Will you welcome to the stage the high flying bird himself Noel Gallagher," Bono said as Noel joined the band.
NME reports that Bono also invited two brothers from the audience on to the stage and handed them both acoustic guitars to sing Angel Of Harlem.
The U2 frontman also made references to the migration crisis in Europe throughout the show with projections of refugees on the band's giant LED screen during Bullet The Blue Sky.
"What do you want, a Europe with its heart open or its borders closed to mercy? I know what I want a place called home," he said.
Later he added: "Think of an island close to here where we have peace. Sing for the peacemakers of Ireland and transfer that wherever you want. For me tonight that is Syria."
The full set-list for U2's London gig Monday was:
The Miracle (Of Joey Ramone) - Out Of Control - Vertigo - I Will Follow - Iris (Hold Me Close) - Cedarwood Road - Song For Someone - Sunday Bloody Sunday - Raised By Wolves - Until The End Of The World - The Fly - Invisible - Even Better Than The Real Thing - Mysterious Ways - Desire - Angel Of Harlem - Every Breaking Wave - October - Bullet The Blue Sky - Zooropa - Where The Streets Have No Name - Pride (In The Name Of Love) - With Or Without You - City Of Blinding Lights - Beautiful Day - Mother And Child Reunion - I Still Haven't Found What I'm Looking For
U2 play the SSE Arena in Belfast on November 18 and 19 before four nights at Dublin's 3Arena on November 23, 24, 27 and 28.
