Prince William shows off his dance moves at Taylor Swift's concert in London. 

The 42-year-old royal was caught on camera grooving to Swift's "Shake It Off" during her Eras Tour stop on Friday, June 21. 

In fan-captured footage, William is seen enthusiastically dancing in the stands while dressed in a casual blue outfit. 

@kkinldn Shake it off Prince William #princewilliam #erastourtaylorswift #erastour #whiteclawuk original sound - KK

 

Princess Charlotte joins in beside him, swaying to the music as Swift, 34, performs on stage.

Earlier, Swift was able to snap a selfie with Prince William, Prince George, and Princess Charlotte, which was shared on the Prince and Princess of Wales' official Instagram account. 

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The photo captures Swift alongside the royals, with a caption expressing gratitude: "Thank you @taylorswift for a great evening! #LondonTSTheErastour."

In a photo posted on her Instagram account, Swift shared a snapshot of herself posing with Prince William, Prince George, 10, and Princess Charlotte, 9 alongside her boyfriend, Travis Kelce, 34. This marks the first time she and Kelce have appeared together in a social media post. Hence, many said the two have finally gone Instagram official. 

Despite the momentous post for her and her boyfriend, her caption was all about Prince William and London. "Happy Bday M8! London shows are off to a splendid start," the singer captioned her post, referencing Prince William's birthday

While William, George, and Charlotte enjoyed Swift's performance, Prince Louis, 6 likely stayed home with mom Kate Middleton. Kate has kept a low profile in recent months as she undergoes cancer treatment. Her most recent public appearance was on June 15 at Trooping the Colour, marking her first outing with the royals since Christmas.

Earlier on June 21, Swift was greeted in London by the royal guard, who performed "Shake It Off" in front of Buckingham Palace to welcome her to the city.

Fans commented on the said video footage positively, claiming they're happy to see the royal chill out and dance amid all the troubles he's facing. One said, "Prince William is the Swiftie we all needed. He is positively unhinged in the best of ways right here!"

Many expressed wonder and elation at the thought that the future king is a Swiftie. "This 5 seconds was the best William publicity in ages," one wrote.

This is hardly the Prince William's encounter with Taylor Swift.

To recall, over 10 years ago, Taylor Swift, Bon Jovi, and Prince William took the stage together and performed Bon Jovi's "Livin' on a Prayer" at a Kensington Palace charity event in London in November 2013. 

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