The secret of actress Demi Moore's youthful looks can now be explained - she's signed up as the spokesmodel for beauty brand Helena Rubinstein. The L'Oreal-owned company will use the star to advertise all its products.

Moore is no stranger to the modeling world - she launched her career as a pin-up girl aged 16 before being signed by prestigious fashion houses including Versace and Donna Karan.

(This news article provided by World Entertainment News Network)