Taylor Swift and Katy Perry have bad blood.

Once, they were close friends. Now, they’re sworn enemies, playing chess against each other on a celebrity battlefield, each one trying to win over each other’s fans.

The latest move is Swift’s release of “Look What You Made Me Do,” the first single from her forthcoming album “Reputation.” Its lyrics are an opaque attack on her celebrity rivals, who include Perry, Kim Kardashian, and Kanye West.

It’s the same day that Perry released her music video for “Swish Swish,” which is widely understood to be a diss track about Taylor Swift.

Swift also announced that her “Look What You Made Me Do” music video will premiere during the MTV VMAs Sunday night, which Perry is hosting. Swift isn’t scheduled to perform at the event, and the music video premiere announcement came as a surprise.

It’s far from the only time Swift has interfered with Perry’s spotlight. She added all of her music to Spotify, which she avoided for several years, the same day that Perry releases her album “Witness” in June.

But before Swift and Perry were mortal enemies, they were once great friends.

Here’s how their friendship fell apart.

They were hanging out with Miley Cyrus and, by all accounts, it was pleasant. Shortly afterwards, they had their first exchange on Twitter.

Swift concocted an elaborate release for “Look What You Made Me Do.”

Over the course of a week, Swift wiped away all of her social media accounts and released a series of cryptic snake videos. It all led to the announcement of her forthcoming album “Reputation,” due November 10, and her first single “Look What You Made Me Do.”

“Look What You Made Me Do” isn’t a traditional diss track, but it’s about her enemies, and those include Katy Perry.

With a music video premiere happening at the forthcoming VMAs, which Perry is hosting, Swift has found an elegant way to draw attention away from her and to herself.

It also helps that Perry’s music video for “Swish Swish,” released the same week, comes across as someone trying way too hard to be liked. Taylor Swift is winning — for now. 

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