Once upon a time, there was mad love between Katy Perry and Taylor Swift.

In response, the “California Gurls” songstresswrote,“You’re as sweet as pie!

Let’s write a song together about the subject we know best… for my new record.

Katy Perry and Taylor Swift posing for photos

It’ll be brilliant.”

IT’S LIKE U STEPPED ON A KITTEN."

Unfortunately, their apparently close friendship disintegrated shortly thereafter.

Taylor Swift and Katy Perry posing for photos

Swift then seemingly alluded to Brownlie by asserting, “She basically tried to sabotage an entire arena tour.

She tried to hire a bunch of people out from under me.”

It’s unlike you to pit women against each other.

Taylor Swift and Katy Perry smiling with Nicki Minaj and Selena Gomez

Maybe one of the men took your slot."

She alsoretweetedan old post of hers that read, “Time, the ultimate truth teller.”

Karma," (viaYouTube).

Calvin Harris and Taylor Swift walking

Especially when someone tries to assassinate my character with little girls [her fans].

That’s so messed up!"

Meanwhile, Swift dropped her comeback track, “Look What You Made Me Do,” in October.

A split image of Katy Perry and Taylor Swift performing

We can help each other get through a lot.'"

Suffice it to say, no bad blood will tear these two apart ever again.

Taylor Swift and Katy Perry hugging