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U2 welcomed fellow Rock and Roll Hall of Fame member Patti Smith to the stage at the end of their show in London Thursday night.

The band dropped a hint of things to come during their second song when they tagged their own "Gloria" with Them's "Gloria," which Smith remade with her own additional lyrics on her 1975 debut album Horses.

During the encore, the band played "Bad" and Bono tagged the end of it by singing "G-L-O-R-I-A," which brought Smith to the stage to sing. Then U2 backed Smith on her own song "People Have the Power."

Photo: Getty Images