The royal headpiece is the one Kate has worn the most during her royal life and was also a favorite of her late mother-in-law, Princess Diana, who wore it on multiple occasions. According to the Court Jeweller, the special tiara is more than 100 years old and was originally commissioned from the jeweler Garrard by Queen Mary in either 1913 or 1914.

Catherine, Princess of Wales and Prince William - or the Duke and Duchess of Rothesay, as they are known in Scotland - were caught laughing at the "mishap" during their recent visit to Scotland