It’s almost time for everyone’s favorite game: Guess the people that Taylor Swift skewers in her songs.

In a Rolling Stone cover story released this week, Swift built up the suspense before the October release of her first official pop album “1989.” The singer, known for spilling unflattering details about her exes in her music while never explicitly naming them, offered a surprise clue about the “angriest” song on her upcoming record called “Bad Blood”: It’s actually about a fellow female artist, and all signs point to none other than pop star Katy Perry.

If that’s the case, the most anticipated album of the fall just got a lot more interesting. Who doesn’t love a good feud between super-famous singers? Naturally, Swift didn’t name names to writer Josh Eells, but she did say that it was a classic “frenemy” relationship:

“For years, I was never sure if we were friends or not,” she says. “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 evidence: Swift and Perry used to be pals, if their tweets back and forth were to be believed. Then last summer, three of Swift’s back-up dancers abruptly left in the middle of Swift’s massive “Red” tour to go work for Perry’s upcoming “Prism” world tour. (The trio previously worked for Perry.) One of them, Lockhart Brownlie, gave an interview confirming that Perry contacted them and offered them new jobs. “We weren’t really dancing in Taylor’s tour anyway, so I had got a little bored, and I really wanted to do a promo tour,” Brownlie said.

While this speculation has been growing, Perry seemingly confirmed the chatter with a mysterious tweet Monday night that read “Watch out for the Regina George in sheep’s clothing…” (For those unfamiliar: Regina George is the ultimate mean girl in the movie “Mean Girls.”) So, if we’re reading into this, Perry is trying to warn us not to believe Swift’s famously angelic persona?

Either way, Swift also told Rolling Stone that “there might have been a personal element to the conflict.” As we all know, Swift’s most brutal song on her album “Speak Now” was “Dear John,” taking down her ex-boyfriend John Mayer. Perry, of course, dated Mayer for years after he and Swift split.

Knowing Swift, she’ll never confirm the identity: But if the hints prove true, it looks like Perry isn’t willing to play along.