He has previously sung on stage, karaoke style, with Swift and Jon Bon Jovi.
Relaying the story to listeners of the Kelces’ podcast, New Heights with Jason and Travis Kelce, Swift’s boyfriend said of the 2013 royal engagement: “Tay got him out of his shell and sure enough they got up there, they ripped it, and they said he had a blast.
“And I’m just like… I dunno if any other prince is doing that? He was cool enough to be a part of it. It just shows you how personable he is.”
Returning to the Eras tour night, Jason said: “William was fantastic. But the highlight was Princess Charlotte. Prince George was great too. She was so f—–g adorable.”
“She was a superstar,” Travis agreed.
Jason, who has three daughters, said: “She had a fire to her, she was asking questions. That was the most electric part.”
Travis added: “I love it when parents ask their kids to be vocal. It’s such a great parent move.
“Just a meet and a picture [with Taylor]… no. Let them have a moment, let them feel comfortable in talking to people.
“If anyone’s doing it right, William’s doing it right. So thank you Your Royal Highness, it was awesome meeting you. And very much Charlotte and George.”
The brothers ended the section by joking that “we’re not even sure if we’re allowed to tell you that”.
The full discussion can be heard on the latest episode of New Heights.