Harry Styles has celebrated his 22nd birthday, and marked it with a tweet referencing his super-famous ex.

The One Direction heartthrob posted this message on his big day:

He is referring to Taylor’s single, 22, in which she sings that phrase.

The music stars dated briefly in 2012 and it is widely believed that several songs on Taylor’s smash-hit album 1989 are about him.

Taylor Swift performs on ABC's Taylor has penned numerous songs about her famous boyfriends and Harry is no exception (Greg Allen/AP)

 

Harry also took another big step on his birthday by cutting ties with One Direction’s long-time management team, Modest Management, to join Jeffrey Azoff at CAA.

The band is currently on an extended hiatus.

Niall Horan, Harry Styles, Liam Payne and Louis Tomlinson of One Direction perform on stage during Capital FM's Summertime Ball at Wembley Stadium,Fans are hoping this is not the end for One Direction (Yui Mok/PA)

 

Modest executives Richard Griffiths and Harry Magee told Billboard: “We wish Harry the very best. It has been a real pleasure working with him.

“Harry is a total gentleman, and we know our good friend Jeffrey Azoff will look after him.”