LUXEMBOURG - JUNE 23:  (top row, from L to R) Princess Tessy of Luxembourg, Prince Louis of Luxembourg, Princess Claire, Prince Felix of Luxembourg, Prince Sebastien, Princess Alexandra of Luxembourg ; (bottom L to R) guest, Xavier Bettel,   Grand Duchess Maria Teresa of Luxembourg, Grand Duke Henri of Luxembourg, Mars Di Bartolomeo, Princess Stephanie, Prince Guillaume of Luxembourg celebrate National Day 2 at Philarmonie on June 23, 2016 in Luxembourg, Luxembourg.  (Photo by Sylvain Lefevre/Getty Images)