WATCH: Kate reveals cancer diagnosis in powerful video

The Princess has started a course of preventative chemotherapy

Hi Royal Clubbers,

We've had the really devastating news that the Princess of Wales is undergoing preventative chemotherapy, which she started almost one month ago.

This is a lot to digest, and we're sure like all of us, you'll be sending your best thoughts and well wishes to the Princess and her family.

She has filmed a video with BBC Studios in Windsor, …