It sounds a bit fishy but caviar has long been an ingredient in cosmetics.

Catherine Zeta-Jones reportedly visits Hari's Salon in South Kensington, London, for its unique hair treatment. It is made with Iranian caviar and claims that the fish oils can replace lost moisture and add shine to dull locks.

The 100 treatment also includes caviar canapés and a glass of champagne and must be booked five days in advance to allow for preparation.