Kansas City Chiefs star Travis Kelce is accustomed to appearing in stadiums in front of thousands of roaring fans, but this time, it wasn't for a football game.

The 34-year-old tight end joined his girlfriend, Taylor Swift, onstage during the third of her eight sold-out concerts of "The Eras Tour" at the 90,000-capacity Wembley Stadium in London, England, on Sunday, June 23.

The three-time Super Bowl champion joined the 14-time Grammy Award winner during a transition and outfit change for her song "I Can Do It With a Broken Heart," a segment the singer introduced when she first incorporated her new "The Tortured Poets Department" album into the tour.

Kelce went all out with his wardrobe, wearing a top hat and a black tailcoat while carrying arguably the most famous artist in the world in his arms.

Swift will return to Wembley Stadium for additional shows on August 15 to 17 and 19 to 20.

Taylor Swift makes Travis Kelce 'Instagram official'

Despite their romance making headlines for almost a year, Swift had not posted about Kelce on her social media accounts until last Friday, June 21, during the first day of her shows in London.

The pop star chose a royal moment, posting a selfie of herself alongside Prince William of Wales and his children, Prince George and Princess Charlotte, as the heir apparent to the British throne celebrated his 42nd birthday at the concert.

Kelce was included in the photo wearing a USA hat.