The surprise duet happened during Swift's second night at the arena
Swift began to perform the song solo while playing the piano before Williams arrived on stage to sing the rest of the song with her.
He later shared a photo of the two of them together, writing: “What an honour to sing with you tonight @taylorswift13 I’ve got a proper crush. THANK YOU THANK YOU THANK YOU x” See that photo and fan-filmed footage of the ‘Angels’ performance below.
On Friday (June 22), Swift surprised fans with an appearance from One Direction‘s Niall Horan. The singer has previously brought Selena Gomez, Shawn Mendes and Troye Sivan on stage as surprise guests at the tour.
Earlier this month, the singer paid tribute to the city of Manchester on the first UK date of her world ‘Reputation’ tour.
In May 2017, 22 people were killed and 139 wounded when a suicide bomber detonated a homemade bomb as people were leaving an Ariana Grande concert at the arena.
“Concerts are supposed to be about innocence, and about joy and about excitement, and what happened just over a year ago in this city was an attempt to steal that innocence,” she said.
“Ever since then, you have shown such strength,” she continued. “You’ve shown that you’re never going to let anyone forget about those victims”