She has been thoroughly enjoying herself for the past month, partying it up in style in St Tropez on luxury yachts and in VIP clubs.
But it was no joking matter when Paris, wearing a military-style hat, gave the Nazi salute at the end of the night.
The heiress was messing about with her entourage on the deck of an enormous boat in the French Riviera when she took the joke too far and made the offensive gesture.