Prince William, future King of England, showed his Swiftie side by attending Taylor Swift's Eras Tour in London with his children George and Charlotte for his 42nd birthday. The royal family even snapped a selfie with the pop star, thanking her for a great evening on social media. Swift also posted a selfie with Prince William and her boyfriend Travis Kelce, calling the London shows a splendid start. During the concert, Prince William was seen dancing and singing along to "Shake It Off" during Swift's performance, sparking excitement on social media. Other celebrities in attendance included Nicola Coughlan, Cara Delevingne, and Jonathan Van Ness. Swift is set to return to Wembley Stadium in August for more shows as part of her Eras tour. The royal family's support for Swift adds to the singer's already massive fanbase.