VALLETTA, MALTA - NOVEMBER 26:  Camilla, Duchess of Cornwall is presented with a glass Christmas tree on a visit to Mdina Glass, in Ta' Qali on November 26, 2015 near Valletta, Malta. Queen Elizabeth II, The Duke of Edinburgh, Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall arrived today to attend the Commonwealth Heads of State Summit.  (Photo by Matt Cardy-WPA Pool/Getty Images)