She may be royalty and one of the most famous and photographed women on the planet, but to her children the Duchess of Cambridge is nothing more than their loving mum, eager to give them the best childhood she can.
And like any other parent, she wants to make birthdays extra special for each of her three children.
This means there is one sweet tradition she carries out every year the night before her children's special days - and it requires her to stay up late.
