An exuberant Prince William has been captured dancing like nobody’s watching at Taylor Swift’s London concert as he celebrates his 42nd birthday.

The Prince of Wales took two of his children, Charlotte and George, to Swift’s Eras Tour opening night at Wembley Stadium.

The royal trio caught up with the American music sensation backstage and posed for an epic selfie.

Kensington Palace posted a photo of Swift snapping the group shot with a clearly chuffed William, Prince George and Princess Charlotte.

The post to X read: “Thank you @TaylorSwift for a great evening!”

Taylor Swift grabs a selfie with the royals. Photo: X (Prince and Princess of Wales).

Grammy winner Swift also posted a selfie with the royal family members and her boyfriend, NFL player Travis Kelce, and wrote: “Happy Bday M8! London shows are off to a splendid start.”

Later that night, fans enjoying the concert spotted what appeared to be the Prince of Wales “dad dancing” on the balcony to catchy pop song Shake It Off.

The Princess of Wales stayed at home with Prince Louis.

Prince William turned 42 this week which was marked by wife Kate with a personal photo on social media.

The Princess of Wales declared “Happy birthday Papa, we all love you so much!” in a post on Friday morning (local time).

A photo of William and their three children jumping in the air and holding hands, taken by Kate in Norfolk, England, in June, accompanied the message.

Swift’s London concert was also attended by Labour leader Sir Keir Starmer and his wife Victoria.

Asked about the concert by reporters on the campaign trail in south London, the Labour leader replied: “She was fantastic. Absolutely fantastic.”

He added: “I know I will be asked what is my favourite song and I am not going to pretend I have got every album and know every song, although Change is the one for obvious reasons.”

Swift performed in front of other celebrity fans including Bridgerton star Nicola Coughlan, Queer Eye’s Jonathan Van Ness and model Cara Delevingne.

They joined Kelce, his brother Jason and their parents, as well as Swift’s parents Andrea and Scott, as she performed for almost 90,000 people.

Swift’s billion-dollar juggernaut tour takes fans through her back catalogue, including hits from albums 1989, Red and Midnights.

The revamped set list, which she first unveiled at the Paris shows, also includes songs from her latest offering The Tortured Poets Department.

To celebrate her arrival in the capital, murals, a special Tube map, a Taylor trail and a series of events have all been created.

The US pop star has already played shows in Edinburgh, Liverpool and Cardiff and will take to the stage at Wembley again on Saturday and Sunday before the tour moves on to Dublin.

She will return to London again for five nights in August.

It was announced on Thursday that Swift’s fans were expected to boost the London economy by 300 million pounds as the capital hosts more Eras Tour shows than any other city in the world, with nearly 640,000 people expected to attend across the eight dates.

-with AAP