"Wishing The Duchess of Cambridge a very happy birthday today!" the royal family Instagram account shared alongside a snap of Kate Middleton; in another, she smiles alongside the queen.
The duchess turns 39 on Saturday, 9 November, and in honour of her special day, we thought we'd share five things you probably didn't know about the royal.
From the secret "something blue" she had sewn into her wedding gown to her favourite TV show, scroll up to learn more about the Duchess of Cambridge.
Compiled by Bashiera Parker