Taylor Swift says song 'Bad Blood' is about a female celebrity

'We're just straight-up enemies'

Taylor Swift doesn't only have bad blood with some of her exes, she's also "straight-up enemies" with a famous female artist.

The 24-year-old pop star opened up to Rolling Stone about her new album "1989" and one song that isn't about a past love.

"For years, I was never sure if we were friends or not," Swift told the mag about the unnamed female celebrity she wrote the track "Bad Blood" about.

"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?'" she continued. "(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!"

"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?'" she continued. "(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!"

Swift played coy about naming her enemy, but added more details about what went wrong in what she initially thought was friendship.

"It had to do with business," she said. "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 nonconfrontational -- 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 "I Knew You Were Trouble" singer is known for having several famous BFFs including Selena Gomez, Sarah Hyland, Lena Dunham and Lorde, to name a few. Still, she's very specific about what she considers a good friend.

"I think these days girls are pitted against each other to an excessive amount, so we should stick together at all costs," Swift insisted.

"But I don't think you should stick together with girls who extremely dislike you, no matter what you've tried to do," she added.

Although the "Shake It Off" singer seems to know what it takes to be a reliable, trustworthy pal to her girlfriends, she confessed to being hurt by the discourse she endured by the nameless female rival.

"I'm not the female police -- but it broke my heart," she told the mag. "Because I have such a high priority on girls sticking together."

Despite Swift's girl power antics, she let her lyrics do the talking when it came to confronting her adversary.

"Sometimes the lines in a song are lines you wish you could text-message somebody in real life," she explained. "I know people are going to obsess over who it's about, because they think they have all my relationships mapped out. But there's a reason there are not any overt callouts in that song."