But it was Prince William who joined the singer and Bon Jovi on stage in November 2013.
The Prince adjusted his bow tie and rubbed his hands together nervously as he took to the stage, before leaning in to join in with the chorus, gesturing to the crowd to join in.
He then high fived Swift mid-performance.
The Prince recalled the night in an episode of an Apple podcast called Time to Walk in 2021.
He said he was seated next to Swift during the Centrepoint gala at Kensington Palace before she enticed him on stage.
“To this day, I still do not know what came over me,” he said. “Honestly, even now I’m cringing at what happened next, and I don’t understand why I gave in. But, frankly, if Taylor Swift looks you in the eye, touches your arm, and says, ‘Come with me…’ I got up like a puppy and went, ‘Yeah, okay, that seems like a great idea. I’ll follow you.”
He said he walked up onto the stage “in a trance” before coming to his senses halfway through the track.
‘I don’t know the words’
“I wake up and I’m thinking to myself, ‘Am I standing on the stage singing…when I don’t even know the words?” he added.
“I can’t be the doofus who’s going to ruin it for everyone. And so I desperately try to remember some of the words and sing as hard as I can.
“Beneath my black tie, there was a lot of sweating going on. I felt like a swan, where I was trying to keep myself composed on the outside, but inside, the little legs are paddling fast.”
Swift has recalled how the Prince looked at her and started “kind of freaking out a little bit,” saying he didn’t remember the words and telling her “you’ve got to go with me.”
“It was insane,” she told Graham Norton in 2014. “I was very nervous for the whole thing, because I was at Kensington Palace and it was my first royal encounter of sorts.”
The Wembley gig will no doubt come as a welcome treat to the Wales children, who have endured a difficult few months as their mother has navigated cancer treatment.
In a statement released last Friday, ahead of her appearance at Trooping the Colour, she said she was “making good progress” but had good days and bad days and was “not out of the woods yet”.