Harry Styles is the latest celeb to show his support for Emma Watson's United Nations campaign.

The 1D heartthrob posted a pic on twitter holding up a sign for the HeForShe launch, which Emma urged people to get behind during her UN speech.

I'm supporting @UN_Women and @EmWatson in #HeForShe As should you.. pic.twitter.com/RYtM4SKkqN

— Harry Styles. (@Harry_Styles) September 25, 2014

[related]“I’m supporting @UN_Women and @EmWatson in #HeForShe As should you,” he captioned the pic.

Celebrities including Tom Hiddleston, Douglas Booth, Chris Colfer and Joseph Gordon-Levitt have all taken to twitter to express their support for gender equality, some posting selfies holding the 'HeForShe' hashtag up.

"I think it is right that women be involved on my behalf in the policies and decision-making of my country. I think it is right that socially I am afforded the same respect as men," the Brit star declared in her moving speech earlier this week.

You can find out more about the campaign here.