'Sledgehammer' beauties Fifth Harmony have shown their support for World Water Day and urged their fans to help give clean water to children that need it.

Writing on their collective Twitter page this afternoon (March 11), the girls explained how people can get involved and help the cause: "Help us to give clean water to kids on #WorldWater Day with #WaterNow to benefit @WorldVisionUSA Water."

A statement on the organisation's official website shares information on the campaign and reveals that United Nations' World Water Day, which will be the focus of a 'week-long social media blitz', will take place on March 22:

"Every day, nearly 1,600 children die from diarrhoea caused by contaminated water, poor sanitation, and improper hygiene – more than from AIDS and malaria combined. Water Now is a global clean water campaign that raises your voice and the voice of your friends alongside the voices of celebrities and dignitaries in a week-long social-media blitz centered around March 22, 2015, United Nations World Water Day. The global call-to-action will be launched from San Francisco to celebrate the 70th anniversary of the United Nations, which was founded in that city in 1945."

Other music stars supporting the campaign include Kesha, One Direction, Pharrell Williams, Fergie, Justin Bieber, Nick Jonas, The Vamps, Meghan Trainor, Sia, and Canadian sensation Shawn Mendes. 

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Watch a promotional video for the Water Now initiative here: