Taylor Swift Teases Harry Styles Break-Up Song >>Hollywood

It's all over for Taylor Swift and Harry Styles.

And we all know what that means, right? A Harry Styles break-up anthem is on the way!

No, really, Swift herself has teased this possibility, Tweeted to followers yesterday: "Back in the studio. Uh oh..."

Styles should be especially afraid of Taylor's musical wrath, as rumors state the two split when this One Direction member preferred to party on a private island than remain on vacation with his girlfriend.

Photos then hit the Internet of Styles in a hot tub with British reality star Hermione Way.

"They are 100 percent over," a source confirms to Us Weekly, while another adds that Harry "said something he shouldn't have."

But - as was the case with John Mayer, Jake Gyllenhaal,