It all allegedly started when the decorator took photos inside the woman's apartment block on the chic Avenue Foch in the 16th arrondissement of Paris, reported Le Point newspaper.
The Saudi Princess accused the man of taking the pictures just to sell them to the press, although he said it was just part of the job.
"You have to kill this dog, he doesn't deserve to live," the princess allegedly told her bodyguard soon afterwards.
It's alleged that the bodyguard then struck the decorator in the head before tying his hands.
The guard, who was (legally) armed, then reportedly ordered the Parisian decorator to kneel and kiss the feet of the princess, who is the daughter of the former king Khalid of Saudi Arabia.
The victim told police that the ordeal lasted for four hours before another man intervened, taking a copy of the Parisian man's ID and then telling him "to never return to the 16th arrondissement of Paris".
The worker reportedly still tried to charge the Saudis for the decorating job, but was never paid the €20,000 he demanded. He claims that he was never given back his tools either.
The man has reported the matter to police, who said that his bruises were visible at the time of the report.