Prince William celebrated his 42nd birthday by "shaking it off" with Prince George and Princess Charlotte.

On Saturday, 6/22, the Prince of Wales shared a rare behind・the・scenes selfie with pop superstar Taylor Swift herself following a performance of her 'Eras Tour' in London on Friday.

"Thank you @taylorswift for a great night!The prince captioned the post, which was shared via Kensington Palace on its various social media sites.

Swift also shared a behind-the-scenes selfie featuring Prince William, Prince George, Princess Charlotte and her NFL boyfriend, Kansas City Chief Tight End Travis Kelce.

"Happy Bday M8!Swift wrote in a post that featured a photo shared on X, formerly known as Twitter. "The London show has had a great start.

The City of London and the monarchy welcomed Swift with style and open arms. According to the BBC, on Friday 6/21, the Royal Guard performed a version of Swift's hit song "Shake it Off" outside Buckingham Palace during the iconic change of guard.

The Royal family posted a video of their special performance at x, with the caption "cheeky": "Can't stop, won't stop groovin'.

As the BBC noted, "An orchestral version of the song was played to mark the first London date of the 'Eras Tour' making Swift's history at Wembley Stadium.

London Mayor Sadiq Khan also shared a new 'tube map' titled 'London (Taylor's version)', highlighting the stops in different places that "inspired her music."

"This Taylor Swift Tube map is really nice polished," one of his posts featuring an updated map Khan shared on X "Whether you are a Londoner or are visiting London to see Taylor's Era Tour this weekend, London is the place to be." She will explore the New York Times (Taylor's version) and visit all the places that influenced her music.

A video of Prince William fully enjoying the show also quickly surfaced online, with Royal Da keen on Swift's "Shake It Off"

"Prince William dances with cousin Zara Tindall, Princess Charlotte dances with cousin Mia Tindall, Taylor Swift dances with cousin Zara Tindall, and Princess Charlotte dances with cousin Mia Tindall." At a concert by Lars Swift, he said, "Shake it up.", So-called, featuring videos of the royal family getting their groove on.

"Taylor is helping to make sweet family memories," they added.

"Sorry, I'm wheeeeeezing when Prince William is dancing to shake it off," one fan posted on X, featuring another video in which the Prince of Wales is dancing it like a true Swift.

Sky News has even described Prince William's move as "dad dancing."

If there is a medal to show off your A+ Dad skills, Prince William has certainly won it.