Nicole Kidman

Worried about red highlights fading? Nicole Kidman has been known to wash her hair in cranberry juice in order to boost her hair colour, and according to hairdresser Ian Marshall, the antipodean actress's beauty tip might just be worth trying out. "Funnily enough there is some truth behind this," reveals Ian, at Brentwood-based Spargo Hairdressing (spargo-hairdressing.co.uk). "The natural colouring found in certain fruits such as cranberries can actually help refresh and enhance colour."

We recommend: If you're all out of cranberry juice, Fudge's Colour Lock Shampoo and Conditioner (fudgehair.co.uk), works equally well.