The new portrait of Kate Middleton was taken in June at her home in Windsor.
She added that she has been experiencing "good days and bad days."
She wrote that,"On those bad days you feel weak, tired and you have to give in to your body resting.
But on the good days, when you feel stronger, you want to make the most of feeling well."
Kate added that her treatment is ongoing but that she is starting to do "a little work from home" and that she hopes to attend more public engagements over the summer.
Persons:
Kate, Kate Middleton, Matt Porteous, William
Locations:
Windsor