Taylor Swift had more than a few tricks up her sleeve during her The Eras Tour stop at the Johan Cruyff Arena in Amsterdam, the Netherlands on Saturday (July 6).

The pop superstar treated the sold-out crowd to the first live performance of “Mary’s Song” in 16 years, seamlessly blending the 2006 deep cut into a mashup with “So High School” and “Everything Has Changed.”

Eagle-eyed Swifties were quick to pick up on the updated meaning behind the song’s closing lyrics: “I’ll be 87, you’ll be 89 / I’ll still look at you like the stars that shine / In the sky, oh my my my.”

The lyrical Easter egg was a sweet nod to Swift’s boyfriend, NFL star Travis Kelce, who dons the number 87 jersey for the Kansas City Chiefs. Kelce was spotted in the audience grinning from ear to ear during the performance.

Kelce has been making many appearances at Swift’s shows as she makes her way through Europe.

Last weekend, he was in Dublin for some performances and the weekend before he attended all three of her shows in London’s Wembley Stadium. On the third night in London, Kelce arrived with Swift’s parents, Scott and Andrea.

He then made a surprise appearance on stage during the concert, dressed in a full tuxedo and top hat as part of her transition skit for “I Can Do It With a Broken Heart.”

On a new episode of the New Heights podcast, Kelce talked about his big debut and having to carry his girlfriend off stage.

“I was up there with three professionals. You can do no wrong with Taylor on stage. [I kept telling myself], ‘Do not drop the baby. Hold onto the baby,’” he said. “She found the perfect part of the show to put me in. It was, like, the safest option.”

The Amsterdam shows marked a long-awaited return for Swift, who hadn’t performed in the Netherlands since her 1989 World Tour in 2015. The “Karma” singer made the most of her three-night run at the Johan Cruyff Arena, delivering a career-spanning jam-packed set.

On Friday (July 5), Swift surprised fans with the live debut of “imgonnagetyouback,” intertwining the track with Reputation highlight “Dress.” Fans were also treated to an emotional medley of “You Are In Love” and “Cowboy Like Me.”

Next up, Swift will take her show to Zürich, Switzerland for two nights before concluding the European leg with five highly anticipated dates in London.