The Irish stars have been joined onstage by special guests including Lady Gaga and Paul Simon during their Big Apple concert run, but they saved the biggest surprise for the end of their final night, as Bono began telling the crowd about Springsteen's huge influence on the band.

The Boss then walked out to loud applause and together, they performed I Still Haven't Found What I'm Looking For and Stand By Me.

As the New Jersey native left the stage, Bono said, "The kid’s a star! The kid's a star! He can keep the guitar."

Among the famous fans in the audience were former U.S. President Bill Clinton and his wife Hillary, and The Roots drummer Questlove.