Travis Kelce explains how he ‘broke royal protocol’ meeting Prince William despite being given warning beforehand

There's been an unexpected crossover recently in the pop world, and it left one Travis Kelce making a gigantic mistake.

The Kansas City Chiefs are gearing up to square off against their 2021 and 2022 AFC Championship Game opponent in the Cincinnati Bengals on the 15^th of September, and Travis has to be ready.

But thankfully, the Bengals are coming into this game at a loss after they struggled against the New England Patriots’, while the Chiefs are coming in hot.

The Bengals are facing the back-to-back Super Bowl champions, so it must be a scary prospect.

What’s probably scarier than losing an NFL game though is breaking royal protocol, even after being warned against slipping up in front of royalty.

But that’s what Travis faced in recent months.

When his famous girlfriend, Taylor Swift brought the NFL star, 34, out on stage with her during Sunday's (23 June) Eras Tour show at London's Wembley Stadium, who was to know that a royal would be close by?

After the power couple posted a crazy picture showing themselves mingling with the UK monarchy.

When Taylor surprised her fans by sharing a selfie with future king Prince William and two of the Royal children, fans went wild to say the least.

It showed the Prince of Wales alongside Prince George and Princess Charlotte, who was actually seen dancing to 'Shake it Off' which went viral.

The dad dancing was on point.

Because Travis also joined in for the iconic photo, people wondered what it was like as a common man meeting royalty.

But when it was revealed that he and his fellow American football player brother, Jason, had joined the get together with the Royal youngsters, little did anyone know that there was a major blunder during the meeting.

Taylor Swift and Travis Kelce papped a selfie with Prince William and his children. (Instagram/@taylorswift)

In an episode of their New Heights podcast, Travis revealed why he 'broke royal protocol' when meeting Prince William at the show.

He explained: "We met royalty, guys. 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 then chimed in: "He was awesome. He was a good dude."

Travis continued, this time addressing British etiquette: "He was there with little George and Charlotte, and they were an absolute delight to meet.

"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."

Travis and Jason Kelce spilled all on the royal encounter. (YouTube/New Heights)

Jason, who is the former Philadelphia Eagles centre, then explained how they 'broke royal protocol' as they didn't have to bow to the Prince in this instance.

"We did get a warning because, honestly, we don't know the actual [etiquette]," he said.

"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. But [they] came off that way completely."