Princess Mary being a Dane and all*, it's hardly suprising that her facialist of choice would be fellow Denmark dweller Ole Henriksen. But it seems the Princess actually likes Ole rather a lot. As well as being pernamently on call to tend to her rather wonderful looking skin, he also gets invited to shindigs at the Palace so Mary can express her gratitude for all the compliments she gets thanks to his skin skills. Get Princess-like skin yourself with his Micro Mini Peel Kit (£125/$95) - as well as being the Royals product of choice (in Denmark anyway) it also won the top accolade in the Harpers Bazaar Beauty Awards.
* Ahem, actually, she's as Aussie (sorry Erin) but, erm, she still lives in Denmark, as far as I know.