Prince William and Kate Middleton will be taking new titles when Charles is crowned king.
Rumour has it that the Queen, who is turning 92 next month, may be retiring to join her husband Prince Philip, who stepped down from his royal duties last year. Prince Charles could be taking over sooner than anticipated.
As King, it will mainly be up to Charles to decide on what their titles will be, but it's likely to be quite an impressive upgrade.
The most likely title will be The Prince and Princess of Wales, which means Kate will have the title that was held by her late mother-in-law, Princess Diana.
Prince William and Harry already have the title to their name, however they've never officially held the HRH Prince of Wales title.
All this name changing will be new to Kate who is pregnant with their third child but for Prince William it's something he's used to.
