The royal Prince William celebrated his 42nd birthday on Friday night by attending the first London stop of Taylor Swift’s Eras Tour, along with children George and Charlotte.

He then posted a photo of them taking a selfie with the pop star on social media, writing: “Thank you @taylorswift13 for a great evening!”

Swift also posted a selfie from the meet-and-greet, which also included her boyfriend Travis Kelce. “Happy Bday M8! London shows are off to a splendid start,” Swift wrote.

Friday night’s show was the first of three at London’s Wembley Stadium. During the surprise song segment of the performance, Swift delivered the live debut of “Tortured Poets Department” track “The Black Dog” — named after a pub in Vauxhall — which was mashed up with “Come Back Be Here” and “Maroon.” She also played a medley of “Hits Different” and “Death by a Thousand Cuts.”

Other celebrities in attendance included “Bridgerton” star Nicola Coughlan; Cara Delevingne, who is currently leading the West End production of “Cabaret”; and “Queer Eye” breakout Jonathan Van Ness.

Tom Cruise, Liam Hemsworth, Rachel Zegler, Hugh Grant, Mila Kunis and Ashton Kutcher were among the attendees at Swift’s second London show on Saturday.