LUXEMBOURG - JUNE 23: Princess Stephanie and Prince Guillaume of Luxembourg celebrate National Day at Philarmonie on June 22, 2016 in Luxembourg, Luxembourg. (Photo by Sylvain Lefevre/Getty Images)
LUXEMBOURG - JUNE 23: Princess Stephanie and Prince Guillaume of Luxembourg celebrate National Day at Philarmonie on June 22, 2016 in Luxembourg, Luxembourg. (Photo by Sylvain Lefevre/Getty Images)