An Entertainment Tonight insider claimed that Princess Charlotte of Wales is the Swiftie of the British Royal Family.

"Princess Charlotte is the huge Taylor Swift fan in the family. She has wanted to go to the concert for months, but with her mum being treated for cancer, this was a really special day to be able to celebrate her Papa's birthday like this," the insider said about the nine-year-old princess.

Prince William accompanied Prince George and Princess Charlotte on The Eras Tour at Wembley Stadium on the first night of Swift's three-night show in London.

The future King, William, was even filmed dancing as if no one was looking during one of Swift's numbers, thrilling many Swifties online and in the arena. A source told the outlet that William "wouldn't care" that his "dad dancing" went viral online."

According to the source, Charlotte "absolutely loved" Swift's concert.

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"They are really wonderful children. William and Kate have done a fantastic job raising all three of them. They understand and appreciate how lucky they are meeting someone like Taylor Swift," the source added.

READ MORE: Paul McCartney Spotted Walking With a Limp at Taylor Swift's Eras Tour Concert in London

As expected, Charlotte's mother, Kate Middleton, was not present at The Eras Tour because she is currently undergoing preventive chemotherapy for her cancer. Prince Louis, the youngest among the Wales siblings, was also absent.

Swift shared a photo backstage after the performance with her boyfriend, Travis Kelce, along with Prince William, Prince George, and Princess Charlotte.

The global popstar greeted William, who decided to spend his 42nd birthday on The Eras Tour with Prince George and Princess Charlotte.

"Happy Bday M8! London shows are off to a splendid start," Swift captioned her post on Instagram, tagging the official social media account of the Prince and Princess of Wales.

On the other hand, the official social media account of the Prince and Princess of Wales also posted an official photograph of the encounter, thanking Swift for a "great evening."

William stepped up on his duties as a senior working royal after his wife, Kate, and his father, King Charles, were both diagnosed with cancer.

"[William] is focused on his wife and children right now. He really just wanted it to be a special night for Prince George and Princess Charlotte," the source added.

READ ALSO: Here's How Taylor Swift's The Eras Tour Could Boost London's Economy By Almost $400 Million

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