Taylor Swift has written several songs about her exes, and now Harry Styles, who she dated until earlier this year, is aware that her new hit song I Knew You Were Trouble is in fact about him. During this year's BRIT Awards she even performed it in front of him.

"Well, it's not hard to access that emotion when the person the song is directed at is standing by the side of the stage watching", she said about the performance.

"You're balancing the analytical side of your brain which is telling you where to go and how to go there, with the other side of your brain, which is saying, 'Feel everything you're singing, and show it on your face. Feel everything exactly as you felt it when you wrote the song.'", she continued.

Harry Styles hasn't said anything about the certain song, but he has admitted that he thinks Taylor is great at what she does.