Who doesn't love a Christmas filled with endless chocolate tubs, overflowing cheeseboards and Buck's Fizz for breakfast? However, this indulgent diet, coupled with the chilly weather, harsh winds and drying central heating, can wreak havoc on your skin during the festive season, leaving it feeling and looking dry, dehydrated and dull. But there are two famous faces whose skin always seems to be flawless - the Princess of Wales and the Duchess of Sussex – and their secret might just lie in their