Princess Charlotte sticks her tongue out!

The Duke and Duchess of Cambridge have been sailing off Cowes, on the Isle of Wight - to raise awareness of the charities they support.

The first ever King's Cup saw the Royals - along with celebrities - enjoy the Solent in perfect conditions.

The Duchess of Cambridge tried to persuade Princes Charlotte to wave to the crowds. Hundreds of onlookers were entertained by Princess Charlotte who decided to stick her tongue out instead!