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King Constantine, Queen Anne Marie, Crown Prince Pavlos & Crown Princess Marie Chantal Of Greece Attend A Performance Of The Dramatic Theatre, During The Celebration For King Carl Gustav Of Sweden'S 50Th Birthday. (Photo by Antony Jones/UK Press via Getty Images)

King Constantine, Queen Anne Marie, Crown Prince Pavlos & Crown Princess Marie Chantal Of Greece Attend A Performance Of The Dramatic Theatre, During The Celebration For King Carl Gustav Of Sweden'S 50Th Birthday. (Photo by Antony Jones/UK Press via Getty Images)

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Queen Anne Marie Of Greece Attends A Gala Dinner At Akershus Castle On The Evening Before The Wedding Of Crown Prince Haakon & Mette-Marit. . (Photo by Mark Cuthbert/UK Press via Getty Images)

Queen Anne Marie Of Greece Attends A Gala Dinner At Akershus Castle On The Evening Before The Wedding Of Crown Prince Haakon & Mette-Marit. . (Photo by Mark Cuthbert/UK Press via Getty Images)

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GRASTEN, DENMARK - JULY 26: (L-R) Royal Sisters, Queen Anne Marie of Greece, Princess Benedicte of Denmark, and Queen Margrethe of Denmark attend the annual Summer photocall for the Royal Danish family at Grasten Castle on July 26, 2013 in Grasten, Denmark. (Photo by Julian Parker/UK Press via Getty Images)

GRASTEN, DENMARK - JULY 26:  (L-R) Royal Sisters, Queen Anne Marie of Greece, Princess Benedicte of Denmark, and Queen Margrethe of Denmark attend the annual Summer photocall for the Royal Danish family at Grasten Castle on July 26, 2013 in Grasten, Denmark.  (Photo by Julian Parker/UK Press via Getty Images)

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Princess Alexia Of Greece Leaves The Teknon Clinic, In Barcelona, With Her New Baby Carlos, Accompanied By Husband Carlos Morales Quintana, Children Arrietta & Ana-Maria, King Constantine, Queen Anne-Marie, Princess Theodora & Prince Philippos. . (Photo by Mark Cuthbert/UK Press via Getty Images)

Princess Alexia Of Greece Leaves The Teknon Clinic, In Barcelona, With Her New Baby Carlos, Accompanied By Husband Carlos Morales Quintana, Children Arrietta & Ana-Maria, King Constantine, Queen Anne-Marie, Princess Theodora & Prince Philippos. . (Photo by Mark Cuthbert/UK Press via Getty Images)

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Former King Constantine II of Greece, and wife Queen Anne-Marie of Greece, attend an event in honor of the 93 athletes of the Greek mission to the Rio 2016 Olympic Games, at Zappeion hall, in Athens on September 19, 2016 (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)

Former King Constantine II of Greece, and wife Queen Anne-Marie of Greece, attend an event in honor of the 93 athletes of the Greek mission to the Rio 2016 Olympic Games, at Zappeion hall, in Athens on September 19, 2016 (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)