LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall laughs with her daughter Laura Lopes and Annabel Elliot she hosts the 30th Anniversary Garden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall talks to Kathy Lette and Jenni Murray as she hosts the 30th Anniversary Garden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall with Professor David Marsh and CE of NOS Claire Severgnini as she presents the Professor with the Duchess of Cornwall Award for OUtstanding Contribution to the field of Osteoporosis as she hosts the 30th Anniversary Gigarden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall shares a joke greets Richard E Grant and Miriam Margolyes as she hosts the 30th Anniversary Garden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall laughs as she hosts the 30th Anniversary Garden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JULY 12: Camilla, Duchess of Cornwall laughs as she hosts the 30th Anniversary Garden Party for the National Osteoporosis Society in St James Palace on July 12, 2016 in London, England. Due to inclement weather the event was moved indoors. The Duchess of Cornwall has been connected with the charity for nearly 30 years. (Photo by Chris Jackson/Getty Images)

TO GO WITH AFP STORY BY JORDANE BERTRAND A picture taken on June 16, 2016 shows a board (L) with the names of Tirailleurs senegalais (Senegalese Tirailleurs) who died at the Courneau military camp in Teste-de-Buch. The Senegalese Tirailleurs were a corps of colonial infantry in the French Army recruited from Senegal. In April 1916, French military authorities had set a camp in Teste-de-Buch to acclimate colonial troops to European weather. Nearly 70.000 tirailleurs between April 1916 and September 1917 will pass through the 400 huts of the camp. / AFP PHOTO / GEORGES GOBETGEORGES GOBET/AFP/Getty Images

TO GO WITH AFP STORY BY JORDANE BERTRAND A picture taken on June 16, 2016 shows a board (L) with the names of Tirailleurs senegalais (Senegalese Tirailleurs) who died at the Courneau military camp in Teste-de-Buch. The Senegalese Tirailleurs were a corps of colonial infantry in the French Army recruited from Senegal. In April 1916, French military authorities had set a camp in Teste-de-Buch to acclimate colonial troops to European weather. Nearly 70.000 tirailleurs between April 1916 and September 1917 will pass through the 400 huts of the camp. / AFP PHOTO / GEORGES GOBETGEORGES GOBET/AFP/Getty Images