OSLO, NORWAY - JANUARY 17: Queen Silvia of Sweden, Princess Astrid Of Norway, King Carl XVI Gustaf of Sweden and Queen Margrethe II of Denmark wave to the crowd outside the Royal Palace while celebrating the 25th anniversary of King Harald V and Queen Sonja of Norway as monarchs on January 17, 2016 in Oslo, Norway.  (Photo by Ragnar Singsaas/WireImage)