Catherine Zeta-Jones has gorgeous hair and now we know the reason why. The Daily Mail reveals that she goes to Hari’s salon in South Kensington to indulge in a unique treatment. She undergoes a treatment that costs £200 and involves washing her hair with a truffle-based shampoo. Her hair is then smeared with beluga caviar flown in fresh from Iran. The fatty acids in the fish eggs are said to give her hair its famed shine.