Pop siblings HILARY and Haylie Duff have signed up as unofficial spokesmodels for a new water product after discovering it's great for their skin.

SCOTT VINCENT BORBA launched his Borba Water at the Sundance Film Festival in January (05) and many stars already use the nutrient-enhanced H2O, but the Duff sisters are using it religiously.

Hilary will drink Borba Water when she tours America this summer (05) after discovering the liquid, which features moisturising elements and a secret age-defying formula has helped clear up her spotty skin.

Borba claims his "reverse-osmosis water" is so powerful that just two bottles equals the hydrating qualities for skin as eight bottles of normal spring water.

16/05/2005 08:58