Taylor Swift performs The Alchemy for boyfriend Travis Kelce as a surprise song during Paris tour stop of her The Eras tour … as he watches from the crowd alongside Gigi Hadid and Bradley Cooper

Taylor Swift appeared to pay tribute to boyfriend Travis Kelce during her show in Paris on Sunday at La Defense Arena, including the song Alchemy as a surprise track in her setlist.

The 34-year-old songstress had multiple costume changes during her set, which was attended by the Kansas City Chiefs tight end, 34, as well as supermodel Gigi Hadid, 29, and A-list actor Bradley Cooper, 49, who were pictured sitting together in a luxury box suite.

The Grammy-winning artist blended her song The Alchemy — which fans have speculated is about her romance with the NFL star — with her tune Treacherous, according to social media posts from show attendees.

The Alchemy, which is from Swift’s latest album The Tortured Poets Department, includes football-centric references to touchdowns, team play and ‘trying to be the greatest in the league,’ leading a number of the fans to conclude the singer-songwriter was inspired by her ongoing romance.

There was a numerical tie-in to playing a song dedicated to Kelce during Sunday’s show: The concert was the 87th on Swift’s The Eras Tour, aligning with Kelce’s football jersey number, 87.

Kelce, whose teammates on the Super Bowl champion Chiefs include quarterback Patrick Mahomes and embattled wide receiver Rashee Rice, was pictured dancing in the stands to the track.

Swift appeared to include a creative nod to Kelce and his team Sunday when she wore the team’s red and gold colors amid a sequence that included the tracks Bad Blood, Shake It Off and Blank Space.

Sunday night’s production was the fifth time Kelce attended the elaborate tour, which spans the various eras of Swift’s career.

Kelce, who was clad in a short-sleeved off-white top at the show Sunday, previously saw his girlfriend perform in Argentina, Australia, and Singapore.

The stars have been supportive of one another in their careers: Swift was on hand for multiple Chiefs games last fall, as well as in February to watch Kelce and his team best the San Francisco 49ers at Las Vegas’ Allegiant Stadium in the championship game.

Former NFL star Brandon Marshall said that Swift had her longtime adversary Kanye West booted from their area – as he ‘was trying to leverage her celebrity’ to put the limelight on himself – but West denied that had occurred.

Swift and Kelce vacationed with Hadid and Cooper at the quaint Northern California town Carmel-by-the-Sea in late April

Kelce at Sunday’s performance sang along to Swift’s song So High School, which is also believed to have been written about him, according to Us Weekly, which reported that she also blew a kiss to her beau before starting the song.

Other famous faces in the audience on Sunday night included actress Jessica Capshaw and singer Christina Milian.

Swift took to Instagram Sunday to thank her fans in Paris for their support amid her series of shows, in which she performed material from her new album for the first time.

‘This post is dedicated to the new Tortured Poets section of the Eras Tour (aka Female Rage The Musical!) and everyone who made these memories so magical,’ she said. ‘To my crew, fellow performers, and band who worked tirelessly in their break to concoct this surprise for you – but mostly for the fans in Paris.

‘I’m so thankful that it was you we got to show this to for the first time because you gave us so much excitement, passion, and love. I’m SO fired up to play this for every crowd on the tour. See you very soon, Stockholm!’

Swift’s next stop on her record-breaking tour is Stockholm, Sweden.

Swift revealed during her second night in Paris that she has been working on The Tortured Poets Department segment of her Eras Tour since last year

We started planning this surprise for you about eight or nine months ago and then when we got “two months off” of the Eras Tour, we really didn’t take any time off at all,’ Swift told fans during a break in the music. ‘We just went directly back into rehearsals. So I’d like to give it up for my crew, my dancers, and my band.’

The Tortured Poets Department was released on April 19 and is Swift’s 11th studio album.

Swift returned to her tour in style on Thursday as she unveiled new outfits on stage in Europe that she also donned during Sunday’s proceedings.

Fans went wild as the global megastar pulled out all the stops with her high-energy performance. She treated the audience to an edited setlist, with six songs replaced by new tracks from TTPD.

Swift and Kelce struck up a relationship late last summer and they went public in early fall when the singer-songwriter began showing up to his NFL games.

Hadid and Cooper began dating last year, and have since been spotted in London, New York City, and elsewhere as their romance goes strong.