And so it begins!

Taylor Swift revealed that she's back in the studio, fresh off her split with One Direction heartthrob Harry Styles.

Swift tweeted about it, the same way she tweeted cryptically post-breakup with Styles:

This is probably bad news for Styles, who is supposedly very sensitive and upset over the bust up. The couple's whirlwind romance came to an end right around the time most of Swift's relationships do: About the three month mark.

“They are both really busy and never in one place for long. Harry’s really upset about the split and is really sensitive about it,” pals said. “Loads of [Harry's] friends told him to be careful and that it was never going to last, and he feels a little foolish now that it’s fallen apart so quickly.”

The pair broke up during a vacation in the British Virgin Isles -- after which Styles consoled himself with Hermione Way, but ultimately nothing came of it. The couple reportedly had a huge fight, but no one knows over what ... but we bet we will when the song comes out.

Watch the Taylor Swift 'I Knew You Were Trouble' Video