The Twittersphere went into a frenzy today when Niall Horan announced that he and Katy Perry were married. While we know he was just joking around, it's no secret that the One Direction member has a massive crush on the pop star — and for good reason, too!

Click through to see a timeline of Katy and Niall's complicated relationship, then let us know in the comments below if you're surprised by how much history they have together.