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Prince William was dancing like nobody was watching at Taylor Swift's London concert.

That is, if "nobody" was the some 90,000 fellow fans at London's Wembley Arena. While watching the singer's Eras tour show from a VIP box with kids Prince George, 10, and Princess Charlotte, 9, June 21, the Prince of Wales danced to "Shake It Off" and a fan's video of him showcasing his moves has gone viral.

William, who was celebrating his 42nd birthday, and the children got to meet Taylor in person as well. He and the "Blank Space" singer shared photos of themselves taking selfies backstage, with the Grammy winner including her boyfriend Travis Kelce in her pic, making their relationship Instagram official less than a year after they began dating.

"Happy Bday M8!" she captioned her post. "London shows are off to a splendid start."

William, who famously performed with Taylor and Jon Bon Jovi at an event in Kensington Palace in 2013, captioned his pic, shared on his and wife Kate Middleton's Instagram page, "Thank you @taylorswift for a great evening! #LondonTSTheErastour."

The royal family outing comes less than a week after the Princess of Wales joined her husband and kids, including youngest son Prince Louis, 6, at the annual Trooping the Colour parade, a celebration of King Charles III's birthday. It marked Kate's first in-person public appearance since last Christmas and took place almost two months after she revealed her cancer diagnosis. She is still undergoing treatments.

On June 14, Kate shared an update on her health battle, saying on Instagram she hoped to "join a few public engagements over the summer, but equally knowing I am not out of the woods yet."

The princess said she was undergoing chemotherapy and was "making good progress," adding that her "treatment is ongoing and will be for a few more months."

William, the couple's eldest kids and Travis were not the only celebs spotted at Taylor's London concert. Also seen at the show: the athlete's brother Jason Kelce and his wife Kylie Kelce, Bridgerton's Nicola Coughlan, Queer Eye alum Jonathan Van Ness, Leslie Mann and Cara Delevigne.

Read on to see photos of stars who have supported Taylor on her Eras Tour... 

Taylor made her relationship with Travis Instagram official June 21, 2024, with the help of the royal family as they all joined her backstage at her concert in Wembley Stadium in London.

Taylor also took another selfie with the royal family at her Wembley show.

The trio united in the VIP tent in London on June 21, 2024. 

The Knocked Up actress also hung out with the Queer Eye alum at the Wembley concert.

The NFL star was a true London Boy at Wembley Stadium with the Queer Eye star.

Dearest reader, how adorable is this friendship?

The "Dip It Low" singer and her teen daughter Violet were in a lavender haze at Taylor Swift's Paris show.

The Grey's Anatomy actress attended the Eras Tour in France in May 2024, captioning this pic with the Midnights lyric, "Cause we were in Paris."

"It’s fair to say Sydney always delivers," Rita Ora captioned Instagram photos from Taylor's Feb. 23 show, including a snap with Travis Kelce. "Or shall we say our TayTay @taylorswift always delivers!”

Taylor's dad Scott Swift delivered an epic photobomb.

"Got to see an old friend shine tonight," Katy Perry captioned footage on Instagram from the Feb. 23 concert.

The Blink-182 rocker—whose band was playing near Taylor's Sydney venue on the same day—and the Pitch Perfect alum hung out in the VIP tent.

The Oscar winner captioned the moment with friends in Mexico City, "Spamming u w really good @taylorswift Eras Tour content."

The Pretty Little Liars star attended with friends Morgan Pesante, Katie Greenthal and Claire Leahy. "Omg??? @taylorswift putting on a show that was so good I can't even process," she wrote. "Nostalgic, empowering, and sparkly."

The "Bad at Love" singer got in the spirit by making friendship bracelets to trade with fans during the last Los Angeles show.

"Still in the afterglow of the most magical night," the Law & Order: Special Victims Unit star wrote on Instagram Aug. 9 after a bejeweled night out in L.A. "Deepest gratitude to @taylorswift for your poetry and wisdom. You inspire us and connect us to our #delicate tenderness, joy, hope and strength—and most of all, our wish to live and love courageously."

Sharing pics from an L.A. show, Chris Olsen quoted the T.Swift lyrics in his caption, "I DON'T KNOW HOW IT GETS BETTER THAN THIS."

"Eras tour (Dylan's version)," the influencer captioned fits of her rocking a Stella McCartney outfit. "@taylorswift you are a goddess best night ever."

The Hills stars filled a blank space in their calendar with a date night in Los Angeles at the Eras Tour. Heidi Montag captioned their pics, "This was the concert of a lifetime! Legendary! Thank you for the tickets @taylorswift."

"@taylorswift with the fam," Jessica Alba wrote, "what a show!" She and husband Cash Warren celebrated their love story by taking their kids Honor, Haven and Hayes.

The Mad Max star danced to "Shake It off" with her kids August and Jackson. "Thank you for the best birthday ever @taylorswift!!!" she wrote. "We had such a great f--king time."

"What a SHOW," Paula Abdul wrote while posting for a photo with Vince Vaughn and Taylor's parents Scott and Andrea Swift in Los Angeles.

The Vanderpump Rules stars made their wildest dreams come true on the floor with Paula.

The "No One singer" attended the Aug. 5 show at SoFi Stadium in Los Angeles with her 8-year-old son Genesis.

The actress attended one of Swift's shows at SoFi Stadium in Los Angeles with Anastasia Beverly Hills cosmetics founder Anastasia Soare and her daughter, Claudia.

The late Kobe Bryant's wife Vanessa Bryant and their daughters Natalia Bryant, 20, Bianka Bryant, 6, and Capri Bryant, 4 attended Swift's show at SoFi Stadium in Los Angeles Aug. 3. While performing her song "22," the singer approached Bianka at the end of the stage, hugged her and gifted her a black hat she typically gives a fan during the number. The family later got to hang out with the pop star backstage.

The Hills alum was ready to be enchanted at the Aug. 4 show.

The New Girl star shared a family photo on TikTok ahead of the Aug. 4 show.

The duo snapped a selfie at SoFi Stadium on the first night of the Eras Tour in Los Angeles, with Elizabeth Banks writing of Taylor's performance, "She was an Angel and a Unicorn and Pure Magic."

Elizabeth took a pic of Sarah Paulson showing off her Eras Tour merch from the Casamigos suite.

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