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Queen Silvia of Sweden shelters from the rain under an umbrella as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT (Photo credit should read BERIT ROALD/AFP via Getty Images)

Queen Silvia of Sweden shelters from the rain under an umbrella as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT        (Photo credit should read BERIT ROALD/AFP via Getty Images)

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(L-R) Princess Martha Louise, Prince Carl Philip of Sweden, Princess Sofia of Sweden, Prince Nikolaos and Princess Tatiana of Greece and Denmark shelter from the rain under umbrellas as the depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT (Photo credit should read BERIT ROALD/AFP via Getty Images)

(L-R) Princess Martha Louise, Prince Carl Philip of Sweden, Princess Sofia of Sweden, Prince Nikolaos and Princess Tatiana of Greece and Denmark shelter from the rain under umbrellas as the depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT        (Photo credit should read BERIT ROALD/AFP via Getty Images)

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Countess Sophie of Wessex from the UK shelters from the rain under an umbrella as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT (Photo credit should read BERIT ROALD/AFP via Getty Images)

Countess Sophie of Wessex from the UK shelters from the rain under an umbrella as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT        (Photo credit should read BERIT ROALD/AFP via Getty Images)

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(L-R) Countess Sophie of Wessex from the United Kingdom, Prince Albert from Monaco, Grand Duchess Maria-Teresa and Grand Duke Henri from Luxembourg shelter from the rain under umbrellas as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT (Photo credit should read BERIT ROALD/AFP/Getty Images)

(L-R) Countess Sophie of Wessex from the United Kingdom, Prince Albert from Monaco, Grand Duchess Maria-Teresa and Grand Duke Henri from Luxembourg shelter from the rain under umbrellas as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on MAy 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT        (Photo credit should read BERIT ROALD/AFP/Getty Images)

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Hereditary Grand Duke Guillaume of Luxembourg and Princess Stephanie, Hereditary Grand Duchess of Luxembourg shelter from the rain under umbrellas as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on May 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT (Photo credit should read BERIT ROALD/AFP via Getty Images)

Hereditary Grand Duke Guillaume of Luxembourg and Princess Stephanie, Hereditary Grand Duchess of Luxembourg shelter from the rain under umbrellas as they depart from Honnorbrygga in Oslo to go on a trip onboard the Royal Yacht on May 10, 2017 as part of the 80th birthday celebrations of the King and Queen. / AFP PHOTO / NTB scanpix AND NTB Scanpix / BERIT ROALD / Norway OUT        (Photo credit should read BERIT ROALD/AFP via Getty Images)