And fans are now speculating on Twitter that Perry is finally getting her revenge on Swift, through her new single Swish Swish.
The song also features Nikki Minaj, and it didn't take people long to realise that the song appears to refer to Katy's renowned enemy, Taylor Swift. "Watch out for the Regina George in sheep's clothing", Perry tweeted following a Rolling Stone interview in which Swift revealed that another artist tried to sabotage her tour.
The line "Karma's not a liar/She keeps receipts" is also likely referencing the time Kim Kardashian exposed Taylor for lying about her involvement in approving Kanye West making the song "Famous", which had some lines aimed at the singer.
If you need Katy Perry, she'll be right with you after Ruby Rose is done dragging her for basically being the mayor of flop city.
Rose followed up with another tweet criticizing Perry's role as an activist. I got your number 'cause you're a joker, and I'm a courtside killer queen. "I mean "fetch" happen, '" Rose wrote in a frenzy.
It should come as no surprise that Minaj was happy to record a guest verse for Swish Swish, given her own public feud with Swift. There is no one thing that's calling out any one person. Rose called out the pop star for claiming to have entered an era of political activism, only for Perry to subsequently release songs that Rose said have no real bearing or impact on the current news climate.
Taylor Swift's "Bad Blood" was seen as an attack on Katy Perry. The OINTB actor and model is tight with Swift, and she readily went to bat for her.
Katy Perry insists that "Swish, Swish" isn't about any one person. Back in April, she linked up with Migos for "Bon Appétit.", which she released a video for last week. Katy and her label want to have a new single that would help Katy promote her upcoming album. Save for a few suspect tweets and ambiguous quotes, there isn't any definitive proof Swift and Perry are at daggers drawn for each other.