Grace Kelly’s ‘wild child’ daughter, Princess Stéphanie of Monaco, once ran away with the circus after falling for an elephant trainer

Stéphanie moved into Knie's trailer with her three children from previous relationships and traveled around with his circus in Switzerland, according to Mamata.

"Obviously it was not ideal for her children, it was very difficult for them to get educated," Phil Dampier, a royal journalist, said in the film.

However, Mamata told Insider that circus life may have been Stéphanie's way of educating them: "Stéphanie was showing her kids another life is possible and that adventure and romance and following your whims is just as important as knuckling down to whatever the royal family expects you to be."