At royal engagements now, Prince William always refers to his wife as Catherine. But that hasn't always been the case... and it's led to some cross words between royal watchers. So what's the correct way to refer to our future queen? Answering one of the reader questions she gets asked most frequently, Royal Editor Rebecca English looks at how the Princess of Wales's name has become a 'bit of a controversy'. She explains it all, from her sweet childhood moniker to how her preference has changed – and the habit Kensington Palace is now trying to discourage.To read her exclusive insights, sign up to the newsletter today and get the answer in your inbox absolutely FREE on Thursday.Want more of the Daily Mail's unrivalled royals journalism, straight from some of the world's leading experts on the monarchy?In the Palace Confidential newsletter, we bring together the most knowledgeable voices, gorgeous photography and exclusive commentary to expose the truth behind polished public appearances, and reveal the very human drama at the heart of this extraordinary institution.Get unrivalled insider gossip and expert analysis on the King and Queen, William and Catherine, Harry and Meghan and more in your inbox every Thursday.You'll have the chance to ask our Royal Editor, Rebecca English, and other top journalists everything you've always wanted to know.Sign up to the Palace Confidential newsletter HERE.