With Prince Philip having retired from public engagements last year, there's every chance the Queen - who's turning 92 next month - might want to join him at some point. Which is why some people are already getting ahead of themselves (us included), speculating on when Prince Charles might assume the role of monarch.
But when Charles does become King, it'll cause more of a shake-up than simply changing the lyrics of our National Anthem, don'tcha know. The list of heirs to the throne will all bump up a spot, and there'll likely be some rejigging of official titles, too.
Being King, it will be up to Charles himself to make decisions about his family's titles, but it's widely thought Prince William and wife Kate Middleton - who are currently referred to as the Duke and Duchess of Cambridge - will get an upgrade.
The most likely title? The Prince and Princess of Wales.
Although Princes William and Harry already hold a version of that title - they've technically been 'HRH William/Harry, Prince of Wales' their entire lives - they've never officially held the 'Prince of Wales' title themselves.
That privilege has been one for Prince Charles, who became the 21st person to have been honoured with the official title when he was given it in 1958. We all know how much the Royal Family loves tradition, and it's tradition that the heir apparent - the person who's next in line to be monarch - holds the 'Prince of Wales' title.
If this happens, Kate Middleton would theoretically be entitled to be called 'Catherine, Princess of Wales' just like Diana. It remains to be seen, however, whether she would actually assume this title or whether she would choose something else out of respect for her late mother-in-law.
Well, how about that for a boosting of your Royal knowledge.
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