So romantic: Taylor Swift performed a surprise song, “The Alchemy,” for Travis Kelce during her Paris tour stop. He watched and reacted enthusiastically to it…

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

The 34-year-old songstress had multiple costume changes in her set at the show Sunday, 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.

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

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 created the track as an ode to 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