Prince William recently revealed that Kate loves colouring.
He praised illustrator Johanna Basford's work when she picked up her OBE, claiming his wife loves her popular first book Secret Garden.
Adult colouring books have exploded recently as people search for ways to cope with the stresses of modern life.
'Colour therapy' supposedly declutters the mind as it forces you to concentrate on one task, blocking distracting thoughts. And it's a lot quicker than a yoga session and less weird than meditating at your desk. It also brings creativity to those who are lacking it elsewhere in their lives.
Let's face it, this year has been a huge pile of stress. So why not defend against the last of 2016 with your own colouring book. Well, if it's good enough for Her Royal Highness…
Colour like a duchess with the actual book Kate uses: Secret Garden by Johanna Basford. £7.99 from Amazon.
Too stressed for flowers and butterflies? This very adult colouring book lets you throw shade while you shade: Sit the F*ck Down and Colour: Adult Swear Word Colouring Book for Stress Relief by Outrageous Katie. £13.12 from Amazon.
Create your new collection with a book that lets you pencil in a fashion template: The Fashion Colouring Book by Beverley Lawson. £3.26 from Wordery.
If you discovered colouring books way before Kate made them mainstream, this is the book for you: The Hipster Colouring Book. £6 from Book Depository.
And lastly, go fully royal: Colour in Kate by Georgie Fearns. £5.99 from Amazon.