A previously unseen photo of Princess Diana as a teenager on a Swiss ski holiday is to go up for auction.
The intimate black and white picture is thought to have been taken during in 1979 or 1980, when Diana was aged 18 or 19, and before she met Prince Charles.
The photograph shows Diana lying beside a male companion who is resting a book on her shoulder. A bottle of Johnnie Walker whisky is on the window ledge in the background.
The Daily Mirror bought the picture on February 26, 1981, two days after Diana's engagement to Prince Charles was announced.
However, the words "not to be published" were scrawled on the photograph and the picture remained hidden in the paper's archives until it was bought by the private Caren Archive seven years ago.
The photograph is now being put up for auction through RR Auctions in New Hampshire, where it is being marketed as a "salacious teenage image of the future princess."
It is expected to sell for €900 or more.
Eric Caren, owner of the Caren Archive, said: "It's an intimate photo - I don't know the man in the picture and he could be a friend or a boyfriend."
By Alice Philipson Telegraph.co.uk