Did you know that Prince Charles and the Queen don’t use their official titles or put on any pomp and circumstance while they’re chatting to one other at home? Well, some people have unique nicknames for one another; Meghan Markle recently revealed she nicknamed Prince Harry “Haz.” And among her closest friends, the Queen is referred to as Lilibet. But Camilla, Duchess of Cornwall, represents another deviation from convention. Apart from being the step-granny to the Cambridge children, Archie and Lili of Prince Harry and Meghan Markle, she also has five grandchildren of her own, and Camilla is referred to…