Infamous serial dater Taylor Swift has said time and time again that she doesn't like to talk about her personal life. She says all of her feelings about boyfriends come out naturally through her music. However, in an interview with The Sunday Times, Swift made a huge confession: Her song "I Knew You Were Trouble" is about One Direction’s Harry Styles!
In the interview, Swift talked about performing "Trouble" at the BRIT Awards in February, saying that she likes to "feel everything" including the exact emotion she felt when she first wrote the song. (Watch a clip of Swift's performance here.)
So when the interviewer asked if she was horrified to perform the song in front of Styles, the singer said: "It's not hard to access that emotion when the person the song is about is standing by the side of the stage watching."
Considering Styles was the only one of Swift’s past boyfriends at the BRITs, there's only one conclusion to draw: Harry Styles = Trouble.