Never-before-seen photo of a young Princess Diana with an unidentified male friend & whiskey

A never-before-seen photograph of a young Princess Diana lounging across the lap of an unidentified male friend is going to be auctioned off. 

The rare photo is thought to have been taken at a Swiss ski lodge in either 1979 or 1980, which would have made Diana (then Diana Spencer) 18 or 19-years-old. A bottle of whisky rests on the windowsill above her head.

The picture was discovered among the Daily Mirror's old photo archive and is marked with the date 26 February 1981 (believed to be the day it was bought) on the back - two days after Diana and Charles's engagement was officially announced by Buckingham Palace.