Kate Middleton shares new photo of Princess Charlotte to mark her ninth birthday

Happy birthday Princess Charlotte!

To celebrate the young royal's ninth birthday, the Duke and Duchess of Cambridge have released a new photo of their only daughter - and she is one beautiful young lady.

In the sweet snap, the young princess can be seen grinning, leaning up against a post wearing a maroon cardigan over the top of a navy jumper and floral blouse, with a denim skirt.

“Happy 9th Birthday, Princess Charlotte!

Thank you for all of the kind messages today." the caption read alongside the photo on social media.

The birthday girl is looking so grown up!