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TARASCON, FRANCE - JUNE 9: Princess Caroline Of Monaco Attends The Wedding Of Top Model Ines De La Fressange, Tarascon, June 9, 1990. (Photo by Alexis DUCLOS/Gamma-Rapho via Getty Images)

TARASCON, FRANCE - JUNE 9: Princess Caroline Of Monaco Attends The Wedding Of Top Model Ines De La Fressange, Tarascon, June 9, 1990. (Photo by Alexis DUCLOS/Gamma-Rapho via Getty Images)

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MONTE CARLO, MONACO - JULY 12: Princess Caroline of Monaco arrives in the court yard of the Palace of Monaco for an official photograph on July 12, 2005 in Monte Carlo, Monaco. The photo call is part of the day's official events surrounding His Serene Highness Prince Albert II's Official Enthronement. (Photo by Pascal Le Segretain/Getty Images)

MONTE CARLO, MONACO - JULY 12:  Princess Caroline of Monaco arrives in the court yard of the Palace of Monaco for an official photograph on July 12, 2005 in Monte Carlo, Monaco.  The photo call is part of the day's official events surrounding His Serene Highness Prince Albert II's Official Enthronement.  (Photo by Pascal Le Segretain/Getty Images)

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Caroline , Grand prix de l'Arc de Triomphe, 1978. (Photo by PICOT/Gamma-Rapho via Getty Images)

Caroline , Grand prix de l'Arc de Triomphe, 1978. (Photo by PICOT/Gamma-Rapho via Getty Images)

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Princess Alexandra of Hanover (L) and her mother Princess Caroline of Hanover attend the celebrations marking Monaco's National Day at the Monaco Palace November 19, 2016. / AFP / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP via Getty Images)

Princess Alexandra of Hanover (L) and her mother Princess Caroline of Hanover attend the celebrations marking Monaco's National Day at the Monaco Palace November 19, 2016. / AFP / POOL / ERIC GAILLARD        (Photo credit should read ERIC GAILLARD/AFP via Getty Images)

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MONACO - JULY 02: Princess Caroline of Hanover and Princess Alexandra of Hanover attend the religious ceremony of the Royal Wedding of Prince Albert II of Monaco to Princess Charlene of Monaco in the main courtyard at the Prince's Palace on July 2, 2011 in Monaco. The Roman-Catholic ceremony follows the civil wedding which was held in the Throne Room of the Prince's Palace of Monaco on July 1. With her marriage to the head of state of the Principality of Monaco, Charlene Wittstock has become Princess consort of Monaco and gains the title, Princess Charlene of Monaco. Celebrations including concerts and firework displays are being held across several days, attended by a guest list of global celebrities and heads of state. (Photo by Sean Gallup/Getty Images)

MONACO - JULY 02:  Princess Caroline of Hanover and Princess Alexandra of Hanover attend the religious ceremony of the Royal Wedding of Prince Albert II of Monaco to Princess Charlene of Monaco in the main courtyard at the Prince's Palace on July 2, 2011 in Monaco. The Roman-Catholic ceremony follows the civil wedding which was held in the Throne Room of the Prince's Palace of Monaco on July 1. With her marriage to the head of state of the Principality of Monaco, Charlene Wittstock has become Princess consort of Monaco and gains the title, Princess Charlene of Monaco. Celebrations including concerts and firework displays are being held across several days, attended by a guest list of global celebrities and heads of state.  (Photo by Sean Gallup/Getty Images)