The Princess of Wales once let slip one of her royal code names when she stepped out to do some shopping but had accidentally forgotten to take her purse with her
The Royal Family have a number of code names they use for security reasons - and there was a clever selection process for when William and Kate were referred to as the Duke and Duchess of Cambridge
The Princess of Wales has been known to use a pseudonym when she's out and about to try and keep a low profile - and she's not the only member of the Royal Family to do so