COPENHAGEN, DENMARK - APRIL 16:    King Carl XVI Gustaf of Sweden and Queen Silvia of Sweden with Crown Princess Victoria of Sweden and Prince Daniel, Duke of Vastergotland on the balcony at Amalienborg Palace during festivities for the 75th birthday of Queen Margrethe II Of Denmark on April 16, 2015 in Copenhagen, Denmark.  (Photo by Mark Cuthbert/UK Press via Getty Images)