The former Baywatch star recreated the most famous scene from Alfred Hitchcock's thriller Psycho to highlight the needless water use surrounding animal agriculture.

The campaign, 'Make a splash for the environment - try vegan', will be unveiled by Anderson on The Ellen DeGeneres Show on Thursday (21May15).

The heath-conscious animal activist says, "Rivers are siphoned off, not just for the animals but also for crops grown to feed animals on factory farms. Producing one pound of beef uses as much water as about six months of showers."

Photographed by Anderson's pal David LaChapelle, the new ad comes at a very important time for the actress' home state of California, weeks after Governor Jerry Brown issued a controversial executive order to reduce urban water usage by 25 per cent.