Liam Payne's son is his ''world''.

The 'Strip That Down' hitmaker took to social media on Thursday (22.03.18) to post a sweet message to mark his son Bear's first birthday.

Taking to Instagram, Liam wrote: ''Can't believe my little man is one today, where does the time go? Happy birthday son you're my world (sic)''

Meanwhile, the 24-year-old singer previously admitted fatherhood has ''changed him in every single way''.

Speaking in 2016, Liam said: ''It's changed me in every single way. It's the first thing you think about in the morning and the last thing you think about at night ... It's his first Christmas. He's only going to be interested in the wrapping paper, so buy the shiniest one! My holiday plans are to spend some beautiful time with my son and to eat my own weight in lovely Christmas food. You might see a different Liam after Christmas, and then you'll see post-Christmas Liam with a new years resolution, hopefully! It's going to be amazing. We've been arranging getting the stockings and the names on them and all that cute stuff. All my family are coming over. We'll have a big Christmas dinner.''

Liam also says his partner Cheryl Tweedy is a ''natural mother''.

Speaking to BANG Showbiz, Liam said: ''Cheryl's like superwoman. She's done so well and is so happy with herself. She's been working hard and if you do work hard, you get what you want.

''She had her rest time bonding with Bear at the start. She's incredible, a natural mom. We take a million pictures of Bear but we want him to be able to decide what he wants to share when he's older.''