The bad blood between Katy Perry and Taylor Swift is not going to die anytime soon, with John Mayer's girlfriend apparently following an Instagram account under the name SluttyTaylorSwift.

According to Daily Mail, it seems unlikely that Katy Perry would accidentally follow SluttyTaylorSwift because she only follows around 200 accounts.

In fact, the SluttyTaylorSwift sits right on the top of the list of Instagram accounts that she follows.

This development in the Katy Perry and Taylor Swift feud came on the heels of the subtle diss that the "Bad Blood" singer reportedly threw down at John Mayer's girlfriend's way during a recent performance in Foxborough, Massachusetts on Sunday.

"On Sunday, the 25-year-old country-pop crossover performed her hit Bad Blood in Foxborough, Massachusetts during the latest stop in her 1989 tour and possibly took a jab at her 30-year-old frenemy," said Daily Mail.

"In the numerous fan-posted videos, Taylor can be seen letting out a little laugh when she notices a shark puppet peeking over her left shoulder," the article added.

It's unclear just when Taylor Swift and Katy Perry's feud started, but the "Bad Blood" singer reportedly didn't take too kindly with John Mayer's girlfriend stealing her backup dancers for her performance in the Super Bowl.

In an interview with Rolling Stone, Taylor Swift talked about female artists whom she believed to be a fake.

Calvin Harris' girlfriend explained, "For years, I was never sure if we were friends or not. She would come up to me at awards shows and say something and walk away, and I would think, 'Are we friends, or did she just give me the harshest insult of my life?'"

"[Then last year], she did something so horrible I was like, 'Oh, we're just straight-up enemies.' And it wasn't even about a guy! It had to do with business. She basically tried to sabotage an entire arena tour."

"She tried to hire a bunch of people out from under me. And I'm surprisingly non-confrontational - you would not believe how much I hate conflict. So now I have to avoid her. It's awkward, and I don't like it," she added.