Who are the Earl and Countess of Strathearn?
While many may be asking this question, they already know the answer.
While the couple have been known as the Duke and Duchess of Cambridge since their wedding day, Prince William and Kate Middleton go by different titles in Scotland.
On Wednesday, the royal couple kicked off a two-day visit to Scotland, prompting their Scottish titles to be used as they arrived for their first day of outings focused on mental health in Glasgow.
But why the different titles?
Click 'read more' to find out.