The telling lyrics: "Same lips red, same eyes blue / Same white shirt, couple more tattoos."
Who it is supposed to be about: Taylor Swift
Why? It's a well-accepted theory among fans that "Two Ghosts" on Styles's first album is about Swift, mostly because of the clue about red lipstick in the very first line. Styles was asked about it on BBC Radio 1 in May 2017 and he played coy, but it didn't stop the radio host, Nick Grimshaw, from introducing it to listeners as the song about Swift.