Taylor Swift and Travis Kelce wave to each other during 'So High School' performance at Germany Eras Tour show

When Travis Kelce is in the crowd, Taylor Swift always manages to acknowledge him and show everyone how in love the two are.

And during her first night in Gelsenkirchen, Germany, Kelce was there supporting his girlfriend. And one fan even caught him reacting to a very special song during the show.

During Swift's "The Tortured Poets Department" set, Swift sings her hit song 'So High School,' which is written about the singer's relationship with the Kansas City Chiefs tight end.

And part of the performance includes Swift sitting on the bleachers with all her backup dancers, waving and reacting to what is presumed to be a game in front of them. At one moment, she even points and waves (we all know who she is waving too).

So while sitting in a suite during the show, Kelce waved right back to Swift.

It was an incredibly sweet moment.

Swift's song, 'So High School' talks about her current romance, comparing it to a high-school romance.

And she loved it so much, she even added it into the set of her Eras Tour shows.

However, some very lucky fans in Amsterdam got to hear her sing the song twice, when she performance a mashup of 'Mary's Song,' from her debut album, 'So High School,' along with 'Everything Has Changed,' from her album Red.

One fan even referred this as "the Travis Kelce mega mashup."

And Travis even had his phone out during this moment, trying to capture it, remember it.

"I'll be 87; you'll be 89."

When Taylor Swift wrote and released this song in 2006, she definitely had no idea that 87 would become such an important number in her life.

But now it has.

That is the number Travis Kelce wears on the football field and 89 represents 1989 - the year that Swift was born.

And for the first time on the Eras Tour, Swift sang those exact lyrics during her surprise song section of the show, performing 'Mary's Song' from her album Debut while in Amsterdam.

Travis Kelce spotted at Gelsenkirchen, Germany Night 1

Kansas City Chiefs training camp is here, but Travis Kelce still found some time to see Taylor Swift one final time.

The tight end was pictured at Swift's Night 1 Eras Tour concert in Gelsenkirchen, Germany on Wednesday.

This was actually Kelce's 13th Eras Tour show, and as many of us know, that is Taylor Swift's favorite number.