The pop star closed out her three London shows with “Karma,” and included a special thank you to Kelsey in the lyrics.
Swift's girlfriend, Kelsey (34), arrived in a morning suit and carried Swift, who pretended to be unconscious, onto a piece of red furniture.
The US pop star then changed outfit and performed “I Can Do It With A Broken Heart” from his latest album, “The Tortured Poets Department,” to a screaming crowd of around 90,000.
The 34-year-old Pennsylvania native closed her three London shows with the song “Karma.”
She changed the lyrics to include a special shout-out to NFL player Kelsey, singing, “Karma's a Chiefs man, come straight home to me.”
It's a change she's made before while Kelsey was in the audience, but it still drew screams from the assembled fans.
Taylor Swift performs at Wembley Stadium (Ian West/PA)
Celebrity couple Swift and Kelsey were first reported to be dating in September 2023, and the pair have supported each other by attending soccer games and concerts together.
Swift has attended numerous NFL games, including the Super Bowl won by Kelce's team, the Kansas City Chiefs.
Meanwhile, Kelsey has been attending various of Swift's concerts and has been photographed at all three of her London shows.
On Friday, the couple met with Prince Charles and their two oldest children, and Swift posted a selfie of the encounter to her Instagram page.
Swift's London show was attended by several A-listers, including rock legends Paul McCartney and Jon Bon Jovi.
A video widely circulated on social media on Sunday showed Beatles star McCartney, 82, walking through an area of the stadium that was separated from fans, while another photo showed rock star Bon Jovi, 62, wearing sunglasses and a pink hat, watching Swift's performance.
Taylor Swift performs at Wembley Stadium (Ian West/PA)
During the concert, Swift invited 24-year-old singer-songwriter Gracie Abrams onto the stage to sing her new single “Us,” which was released on June 21 and features Swift.
Anti-Hero singer Swift kicked off the UK leg of her hugely successful Erasus tour with three shows in Edinburgh, before going on to play in Liverpool and Cardiff before heading to London.
Saturday night's show was attended by Love Actually star Hugh Grant and Channel 4 News presenter Krishnan Guru-Murthy, who both hailed the experience as “amazing”.
Grant, 63, an actor who appeared in About a Boy, wrote to X: “Dear @taylorswift13, you have an amazing show, an amazing and very kind team, and a huge but amazing boyfriend (#tequilashots).”
“A huge thank you from an old London boy, my wife and my excited 8 year old.”
Guru Murthy, 54, posted a picture of himself with former Newsnight presenter Emily Maitlis on Instagram, writing: “Amazing. She surprised me by playing my favourite song (Meen)!”
Another American actress at Saturday night's event, Rachel Zegler, known for her roles in “West Side Story” and the prequel to “The Hunger Games,” posted a photo of herself at the concert wearing a purple sparkly dress with the caption, “Taylor Swift I love you.”
In a follow-up post to X, she uploaded a photo of herself wearing dozens of friendship bracelets, which have become a staple at Swift's shows, and wrote, “Thank you to everyone who gave me bracelets and for dancing with me and screaming with me and singing with me.”
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On Saturday evening, a fan posted a video online that appeared to show “Mission: Impossible” star Tom Cruise dressed in a black blazer and white T-shirt speaking to Swifties at the stadium.
Another video showed “Little Women” director Greta Gerwig, 40, walking away from fans through part of the stadium.
Other stars were reported to have attended the concert, including “The Hunger Games” actor Liam Hemsworth and Hollywood couple Mila Kunis and Ashton Kutcher.
Friday night's show was attended by celebrity fans including UK Labour Party leader Sir Keir Starmer, “Bridgerton” star Nicola Coughlan, Queer Eye's Jonathan Van Ness and model Cara Delevingne.
The billion-dollar “Eras Tour” will see fans perform Swift's back catalogue, including hits from the albums “1989,” “Red” and “Midnights.”
The revised setlist, which was debuted at the Paris show, includes songs from their latest album, released in April.
Murals, special subway maps, a Taylor Trail and a series of events were created to celebrate her arrival in the nation's capital.
The tour comes to Dublin this weekend before Swift returns to London in August for a further five nights at Wembley Stadium.
