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PARIS, FRANCE - MAY 08: Grand Duke and Grand Duchess, Heirs Stephanie and Guillaume de Luxembourg attend the 'Ami, entends tu ?' Show performed at The Invalides on May 8, 2015 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)

PARIS, FRANCE - MAY 08:  Grand Duke and Grand Duchess, Heirs Stephanie and Guillaume de Luxembourg attend the 'Ami, entends tu ?' Show performed at The Invalides on May 8, 2015 in Paris, France.  (Photo by Bertrand Rindoff Petroff/Getty Images)