Harry Styles is the latest in a string of stars to announce their support for Emma Watson's United Nations #HeForShe equality campaign.

The singer posted a photo of himself on Twitter holding up a page with "#HeForShe" written on it, following suit after stars such as Watson's Noah co-star Douglas Booth, Tom Hiddleston, Forest Whitaker, Russell Crowe and Matt Damon showed their support.

As UN Goodwill Ambassador for Women, Watson launched the campaign in New York earlier this week with a rousing speech calling on men to join the fight against gender inequality.