Saturday.

When the superstar, 34, took the stage at her Eras Tour concert and swept her hair behind her ear, fans pointed out that there was an obvious kiss mark on her neck.

As seen in fan-taken footage from a concertgoer in Stockholm, several fans speculated it was a love bite left by her NFL boyfriendAfter spending five days loved-up with her beau, the singer returned to the European leg of her ongoing Eras Tour.

Fans noticed the evidence of her romantic and intimate trip as she was sitting at the piano and performing songs from her Evermore era.

Wearing a sparkling blue number, she pulled her hair to one side while singing Champagne Problems and revealed the blatant mark.

Concertgoers quickly noticed and took to social media as they shared clips, zooming into her neck.

It comes shortly after Kelce caught Swift’s last concert in Paris, and the pair jetted off to Italy together for a quick getaway.

The couple arrived in Lake Como on Mother’s Day on May 12 and stayed there for nearly five days before leaving on May 17.

On the first day of their trip, eyewitnesses said they enjoyed ‘a long walk around the lake late at night.’

During their late night outing, which the insider called ‘very romantic,’ the couple held hands and ‘would also exchange a kiss every so often.’