LUXEMBOURG - OCTOBER 19:  Prince Haakon of Norway and Princess Mette-Marit of Norway attend the Gala dinner for the wedding of Prince Guillaume Of Luxembourg and Stephanie de Lannoy at the Grand-ducal Palace on October 19, 2012 in Luxembourg, Luxembourg. The 30-year-old hereditary Grand Duke of Luxembourg is the last hereditary Prince in Europe to get married, marrying his 28-year old Belgian Countess bride in a lavish 2-day ceremony.  (Photo by Pascal Le Segretain/Getty Images)