There has long been an assumption that Taylor Swift and Katy Perry hate each other.

The whole thing probably started with a Rolling Stone interview where Taylor Swift vaguely referenced some unnamed pop star.

“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, the other star crossed a line. “She did something so horrible,” Swift says. “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.”

The day after the Rolling Stone piece on Taylor Swift appeared online, Katy Perry tweeted this:

Watch out for the Regina George in sheep's clothing…

— KATY PERRY (@katyperry) September 9, 2014

Regina George is, of course, Rachel McAdams’ character from Mean Girls. She is the “queen bee”, described as “controlling, deceiving, belittling and delusional.”

Taylor Swift recently spoke with the Telegraph, and the name “Katy Perry” did come up.

“And it’s not real if someone appears to never have any issues with anyone. I have my friends, I have enemies. I have bad days when I don’t want to go to a photo shoot, but I’m not going to show up four hours late, I’m going to be there on time. I’m not nice all the time but I try not to be carelessly rude to people who don’t deserve it.”

Issues? Enemies? Come on, say her name …

“When I’m with my friends, we don’t say glowing things about everybody. We’re not sitting around going, ‘You know who’s really special and wonderful?’ That’s not what we talk about – we’re normal girlfriends.”

Finally, the interviewer just asks about Katy Perry, outright.

“I’m not giving them anything to write about. I’m not walking up the street with boys, I’m not stumbling out of clubs drunk. But I’m never going to talk about her in my interview. It’s not going to happen.”

Well, I guess that’s the high road.