Travis Kelce received a 'warning' before meeting Prince William at a Taylor Swift concert.
The Kansas City Chiefs are gearing up for for their first game of the NFL season on 6 September, but perhaps more importantly, fans are eagerly awaiting the arrival of Miss Taylor Swift.
Some would say the pop icon is royalty in her own right, which becomes an awkward claim after members of the actual royal family turned up to one of her Wembley shows as part of her Era's Tour.
On 21 June, the Prince of Wales - along with two eldest children Prince George and Princess Charlotte - was spotted blowing off some steam dancing to the Swift's 2014 hit 'Shake it Off' in the audience.
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Not only this, but the star shared a snap of herself and the royals, as well as her boyfriend Travis, captioned: "Happy Bday M8! London shows are off to a splendid start."
And Travis hasn't held back on revealing details of the encounter, after speaking on his New Heights podcast.
He explained: "We met royalty, guys.
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"There was royalty at the show. I got there early and got to meet Prince William. "How bout that? Your Royal Highness.
"Dude, he was the coolest motherf**ker. He was so cool."
Jason Kelce, his fellow American football player brother, added: "He was awesome. He was a good dude."
Travis continued, addressing the do's and don'ts of British etiquette: "He was there with little George and Charlotte, and they were an absolute delight to meet.
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"I wasn't sure if I was supposed to bow to them - courtesy [or] just be an American idiot and shake their hand.
"We wanted to be polite, especially on this side of the pond."
Jason explained how they received a 'warning', which was probably more of a small word of advice, before meeting the family.
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He said: "We did get a warning because, honestly, we don't know the actual [etiquette].
"Because we weren't at an elegant, official royal event, we didn't have to bow.
"If it would've been an official meeting-of-royalty event, then it would have been that."
Jason concluded: "They were wonderful people, and that's what it's about. "They're part of a monarchy... [it's] hard to be a down-to-earth human being - I would assume.
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"But [they] came off that way completely."
When worlds collide!
Topics: Prince William, Royal Family, Taylor Swift, Travis Kelce, Celebrity
Mia Williams