(L-R) Leah Isadora Behn, Princess Ingrid Alexandra, Prince Sverre Magnus, Maud Angelica Behn, Queen Sonja, Emma Tallulah Behn, King Harald, Crown Princess Mette-Marit, Crown Prince Haakon and Martha greet wellwishers from the balcony of the Royal Palace in Oslo, Norway on May 9, 2017 to mark the 80th Birthday of the King and Queen.  

Photo: Jon Olav Nesvold/ NTB scanpix / AFP PHOTO / NTB scanpix AND NTB Scanpix / Haakon Mosvold Larsen / Norway OUT        (Photo credit should read HAAKON MOSVOLD LARSEN/AFP/Getty Images)
(L-R) Eliza Reid, Iceland's President Gudni Johannesson, Grand Duchess Maria Teresa of Luxembourg, Prince Albert II of Monaco, Grand Duke Henri of Luxembourg, Queen Mathilde of Belgium and King Philippe of Belgium greet wellwishers from the balcony of the Royal Palace in Oslo, Norway on May 9, 2017 to mark the 80th Birthday of the King and Queen of Norway.  

Photo: Jon Olav Nesvold/ NTB scanpix / AFP PHOTO / NTB Scanpix / Jon Olav Nesvold / Norway OUT        (Photo credit should read JON OLAV NESVOLD/AFP/Getty Images)
(L-R) Jenni Haukio, Desiree Kogevinas, Carlos Eugster, Crown Princess Victoria and prince Daniel of Sweden greet wellwishers from the balcony of the Royal Palace in Oslo, Norway on May 9, 2017 to mark the 80th Birthday of the King and Queen.  
 / AFP PHOTO / NTB Scanpix / Jon Olav Nesvold / Norway OUT        (Photo credit should read JON OLAV NESVOLD/AFP/Getty Images)
Queen Sonja and King Harald greet wellwishers from the balcony of the Royal Palace in Oslo, Norway on May 9, 2017 to mark the 80th Birthday of the King and Queen.  

 / AFP PHOTO / NTB Scanpix / Jon Olav Nesvold / Norway OUT        (Photo credit should read JON OLAV NESVOLD/AFP/Getty Images)
Crown Princess Mette Marit and Crown Prince Haakon of Norway greet wellwishers from the balcony of the Royal Palace in Oslo, Norway on May 9, 2017 to mark the 80th Birthday of the King and Queen.  

 / AFP PHOTO / NTB scanpix AND NTB Scanpix / Audun BRAASTAD / Norway OUT        (Photo credit should read AUDUN BRAASTAD/AFP/Getty Images)