Prince Nikolai Of Denmark Celebrates His 18th Birthday At The Royal Ship Dannebrog [Getty Images]

COPENHAGEN, DENMARK - AUGUST 28: (L-R) Princess Marie of Denmark, Prince Joachim of Denmark, Prince Henrik of Denmark, Princess Athena of Denmark, Prince Nikolai of Denmark, Countess Alexandra of Denmark and Prince Felix of Denmark attend the 18th birthday celebration of Prince Nikolai at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark. (Photo by Patrick van Katwijk/Getty Images)

Getty Images Entertainment Patrick van Katwijk