Meghan Markle is a very popular young royal. The former actress married Prince Harry in May 2018, and her star has been rising ever since. She’s even expecting a baby with her new husband, which is due to arrive in the spring of 2019. And yet, curiously, she isn’t ever referred to by the title one would expect of the wife of a prince. Meghan is never called “Princess,” only “Duchess.” Yet Harry’s mother Diana was known all over the world as Princess Diana. So, what’s the deal?