Travis Kelce joins Taylor Swift onstage in London for his Eras tour debut

Kelce donned a top hat and tails for "I Can Do It With a Broken Heart."

Taylor Swift and Travis Kelce have made their relationship stadium tour official.

The Kansas City Chiefs tight end made his debut on his lady love's never-ending Eras Tour in London at Wembley Stadium on Sunday, joining her onstage for the beginning of her performance of "I Can Do It With a Broken Heart."

<p>Gareth Cattermole/TAS24/Getty</p>

Gareth Cattermole/TAS24/Getty

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For the number, off this year's The Tortured Poets Department, Swift is usually carted off by her dancers who convince her to go on with the show, as it were. But this time around, Kelce donned his top hat and tails and carried Swift to her fainting couch, fanning himself with a gloved hand.

Kelce has been spotted in the crowd during all three of Swift's concerts at Wembley this weekend, but this is his first time getting in on the act. Previously, the songstress included her boyfriend by changing up the lyrics to "Karma," singing, "Karma is the guy on the Chiefs, coming straight home to me."

<p>Gareth Cattermole/TAS24/Getty</p>

Gareth Cattermole/TAS24/Getty

While in London, the couple also took selfies with the Royal Family, Prince William and two of his children, Prince George and Princess Charlotte. The pair continued to charm the locals when noted thespian Hugh Grant praised Swift for "an incredible show, an amazing and v hospitable team and excellent if gigantic boyfriend."

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