Travis Kelce's brother Jason reveals what Princess Charlotte was like when he met Royals at Taylor Swift concert

It was the big-name, three-way crossover we NEVER knew we needed.

And today, NFL brothers Travis and Jason Kelce have lifted the lid on what it was like to come face-to-face with the Royal Family.

The day prior, they appeared at Taylor Swift's London gig on Friday evening, with the singer's beau Travis supporting his other half during her Eras Tour.

But if you haven't the foggiest idea what we're raving on about, however, allow us to catch you up...

(Instagram/@taylorswift)

Live from Wembley Stadium last week - having just performed the latest gig as part of her sell-out Eras tour - Taylor, 34, surprised her fans by sharing a selfie with future king Prince William and the Royal children, after the family attended the concert.

Earlier on Friday night, the Prince of Wales - along with two eldest children Prince George and Princess Charlotte - was spotted in the crowds popping, locking and dropping to her 2014 hit Shake it Off.

It wasn't just the Royal additions to singer Taylor's recent upload, however, that sent fans into a frenzy - it was the fact that sportsman Travis, 34, also joined in for the iconic photo.

It later became apparent that he and his fellow American football player brother Jason Kelce had joined the soiree with the Royal youngsters.

Travis appeared on stage with Taylor in London the following night. (Gareth Cattermole/TAS24/Getty Images for TAS Rights Management)

Less than 24 hours later, posing as one of the back-up dancers, Kansas City Chiefs favourite Travis looked very dapper donning his tuxedo and top hat to pair, as he was dragged up on stage with his chart-topping girlfriend for a surprise appearance.

Ever since, fans have been desperate for Travis to give us the lowdown on - not only how it felt to perform in front of a music-loving crowd as big as Wembley Stadium - but what it was like to become acquainted with TWO future monarchs.

And thankfully, today, he gave his and Taylor's fan-bases exactly what they'd wanted, recalling his chaotic-sounding weekend on the most recently released episode of he and brother's popular podcast, New Heights.

Jason began the discussion, recalling his own experience meeting the youngsters, revealing why Princess Charlotte was his firm favourite.

The duo recalled their royal encounter. (YouTube/New Heights)

"I gotta say, Prince William was fantastic but the highlight was Princess Charlotte," he gushed.

"Prince George was great too, but she was so f**king adorable. I can’t express, maybe it’s because I have three girls, she had fire to her, she was asking questions, that was the most electric part."

Travis then sweetly added: "I love it when parents ask their kids to be present and be vocal."

A-dor-able!