Plain old water wasn't good enough for Cleopatra, who preferred to bathe in asses' milk.

Catherine Zeta-Jones, it would seem, has a similar attitude to shampoo and conditioner.

While most of us have to make do with a handful of fragrant soapy foam, the Welsh actress smears on truffles and caviar.

At ￡200 a time, just for the fish eggs, looking good does not come cheap.

There's something fishy here: Catherine Zeta Jones uses caviar to
give her hair its noteworthy shine

But she credits the gourmet delights for giving her long brown tresses an unbeatable shine.

The Beluga caviar is apparently flown in from Iran five days ahead of her treatments at a beauty salon in South Kensington.

"Catherine discovered the caviar treatment last summer and was astounded by the difference it made to her hair," said a source.