Taylor Swift welcomed Robbie Williams to the stage during her Saturday night concert at London's Wembley Stadium to perform the British singer's 1997 hit "Angels."
Swift opened the ballad alone at the piano before Williams – wearing a Reputation Tour shirt – emerged onstage unannounced, sparking a thunderous response
This article originally appeared on www.rollingstone.com: Watch Taylor Swift, Robbie Williams Perform ‘Angels’ in London