It's no secret that Katy Perry and Taylor Swift aren't part of each other's squad. The two used to be close friends (even after that time they both dated John Mayer), but after that 2013 Rolling Stone article seen around the world, things went south. Here's a quick refresher from the article:

"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."

Yikes. Well, if the Bad Blood music video means anything, it's that the feud is far from over, and Perry is making it known in a salty video she took while at a Kanye West concert. While spending the morning of her birthday placing her vote for Hillary Clinton, Perry had more big plans at night — to dance her ass of at the Kanye West concert in Los Angeles.

Halsey via Snapchat! With Katy Perry pic.twitter.com/Pdop7D7sJi — HALSEY PHILIPPINES (@halseyph) October 26, 2016

But it was during West's controversial song "Famous" that Perry made her feelings for Swift known. During everyone's favorite line — "I made that b*tch famous" — Perry added the below video to her Instagram story:

Katy recording herself during Kanye's Taylor lyrics 💀💀💀💀 pic.twitter.com/YRPexiW8BA — malek (@legendarymalek) October 26, 2016

Yeaaaaaah. Come on, that's shade right there. And despite their history, it's surprising, especially considering she was just at Drake's birthday party with Swift (and their ex John Mayer) without anything dramatic happening. But who knows! You can always hate someone from afar, I know I have.

Do you think Katy Perry was throwing shade? Sound off in the comments below.