Harry Styles has claimed his first US number one as 'Watermelon Sugar' hit the top spot on the Billboard Hot 100.

The track - apparently about "touching" - was given an official release in May but has been available for around nine months.

The song was number seven in the charts last week but a huge surge in digital sales this week saw it rise to the summit, usurping Taylor Swift's 'Cardigan' in the process.

'Watermelon Sugar' is only the second solo effort from a One Direction member to top the US charts, with Zayn Malik's 'Pillowtalk' having hit the dizzy height in 2016.

Despite the group's unprecedented worldwide success, the boyband never claimed a US number one themselves, peaking at two with 'Best Song Ever'.

Watch the video for 'Watermelon Sugar' below: