During her performance on Sunday at La Defense Arena in Paris, Taylor Swift seemed to honor her boyfriend Travis Kelce by incorporating the song Alchemy as an unexpected guitar track into her repertoire.

The 34-year-old singer had several wardrobe changes during her performance on Sunday. Supermodel Gigi Hadid, 29, and A-list actor Bradley Cooper, 49, were also present, and they were all spotted seated together in an opulent box.

According to social media photos from the concert, the Grammy-winning musician combined her track Treacherous with her track The Alchemy, which fans have theorized is about her affair with the NFL star.

Several fans concluded that Swift wrote “The Alchemy,” a song from her most recent album The Tortured Poets Department, as a tribute to her ongoing romance because it contains football-related references to touchdowns, teamwork, and “trying to be the greatest in the league.”

Playing a song in honor of Kelce on Sunday’s performance had a numerical tie-in: Swift’s The Eras Tour stop was the 87th, matching the number on Kelce’s football jersey, 87.

During her performance on Sunday at La Defense Arena in Paris, Taylor Swift, 34, seemed to honor her boyfriend Travis Kelce, 34, by incorporating the song Alchemy as an unexpected guitar track into her set list.

Supermodel Gigi Hadid, 29, and A-list actor Bradley Cooper, 49, were seen watching the performance from a lavish box at the location.

Kelce was seen dancing in the stands to the track. Patrick Mahomes, the quarterback for the Super Bowl champion Chiefs, and struggling wide receiver Rashee Rice are among Kelce’s teammates.

When Swift donned the red and gold team colors on Sunday during a set that including the songs Bad Blood, Shake It Off, and Blank Space, it seemed to be a playful homage to Kelce and his group.

This Sunday’s show marked Kelce’s fifth visit to the ornate tour, which takes fans through the several phases of Swift’s career.

Kelce, who attended the event on Sunday wearing an off-white blouse with short sleeves, has previously seen his girlfriend perform in Singapore, Australia, and Argentina.

Throughout their careers, the celebrities have supported one another: Swift attended several Chiefs games in the fall of last year and the championship game in February at Allegiant Stadium in Las Vegas, where Kelce and his team defeated the San Francisco 49ers.

Former NFL player Brandon Marshall said that Swift had her longstanding rival Kanye West heckled in their neighborhood because he “was trying to leverage her celebrity” to draw attention to himself. However, West refuted Marshall’s claims.

In late April, Swift, Kelce, and Hadid took a vacation to the charming Northern California town of Carmel-by-the-Sea.

Swift appeared to include a creative nod to Kelce and his team Sunday when she wore the team’s red and gold colors

Swift donned the ensemble amid a sequence that included the tracks Bad Blood, Shake It Off and Blank Space

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. Pictured at the Super Bowl in February in Las Vegas

Kelce was pictured dancing in the stands to the track

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

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

Kelce previously saw his girlfriend perform in Argentina, Australia and Singapore

Cooper and Hadid appeared to be having a great time at the concert in Paris

The stars have been supportive of one another in their careers, as Swift was on hand for multiple Chiefs games last fall

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.

The singer took a moment during her show to share details with her attentive audience.

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

She said of the new material and stage show around it, ‘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’

Swift said in her social media post, ‘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’

Swift unveiled new outfits for the European leg of The Eras Tour, including this gown she was seen performing in on Sunday

Swift donned a lithe red ensemble amid her concert Sunday at La Defense Arena

The dynamic musical artist delivered a high-energy performance for her fans in Paris

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

Swift’s tour features a three-hour set list of her biggest songs to date. Pictured Saturday

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. Pictured Saturday.