Taylor Swift fans insist they saw something very risqué during her recent concert performance nguyensa

Taylor Swift's massive Eras Tour is officially on the European leg, with many more millions of her fans now finally getting the chance to see her live.

After the worldwide tour made the singer reach new heights, not least the fact she's now a billionaire, Swift is no doubt on top of the world.

The 'Shake it Off' singer took to the stage in Stockholm, Sweden on Saturday (18 May) to perform some of her tracks to adoring fans.

But as seen in fan-footage posted to social media from the show, fans are speculating that Swift had a little something on her neck.

Fans noticed the mark as Swift was sitting at the piano and performing songs from her Evermore era.

As she pulled her hair to one side while singing 'Champagne Problems', you can notice what appears to be a mark on her neck.

Concertgoers quickly picked up on it and posted various clips of it to social media sites.

Many fans online have speculated the alleged love bite has come from her beau, former NFL player Travis Kelce.

One person said: "Flat iron burn or hickey and in her idgaf era?"

While another wrote: "So High School is getting a little too real," in reference to the song from 'The Tortured Poet's Department'.

However, some suggested that it could instead be a 'scratch from a costume change', while others say it was 'probably a burn'.

Swift has recently returned to the European leg of her Eras tour after enjoying a romantic getaway with Kelce in Lake Como in Italy.

Reports suggest that the celebrity couple enjoyed a bit of downtime in a $23,000-a-night villa, while they also enjoyed a romantic boat ride.

It comes after Kelce issued a response to Swift fans who criticized him for concert etiquette.

The NFL star went along to Swift's concert in Paris and created some fuss, which even his brother, Jason Kelce, took notice of.

Footage was released of Kelce recording his girlfriend’s set, but he had his flash on.

His brother, Jason spoke about it during the New Heights podcast, saying: “You got caught, pulling an Ed Kelce move here taking a video with your flash on.

“What are you doing, Trav? You're supposed to be better than this.'

The tight end responded: “Oh, you know, the settings on the camera, if it's dark, it's going to automatically put the flash on.

“I was just trying to get some good, you know, some good video, some good memories. I don't give a damn. Did I get clowned for that? Sorry.”

Nonetheless, Kelce gushed about his partner's concert, adding: "It was fun. It was a blast. I had a blast at Tay's show,

“Her new rendition of the Era's Tour. I suggest everyone go see it - it has her new Tortured Poet's Department, a few songs, a handful of those songs in the new show.

“Which means there's a new segment, and new lights and like new dancing - new everything to the f***ing show.

"So I suggest everyone get out there and see it. It was absolutely unbelievable. I enjoyed every bit of it.”