After spotting a Twitter snap of Katie treating her skin to a face mask, we couldn't help but notice the towers of products sitting behind her...
"My bathroom is full of different beauty products," says Katie. "I love it and am always looking for new body scrubs or face masks to add to the collection. A girl can never have too many bath bombs or products, that's for sure!"
So, what's her secret to smooth, glowing skin?
Well, Katie loves using luxurious bath and body products by Laura Mercier which come in delicious scents (like Crème Brûlée Honey Bath, £31, and Crème de Pistache Soufflé Body Crème, £43.50), as well as lotions and potions by Temple Spa.
For more purse-friendly options, Katie likes to banish the flakes with Sanctuary Body Scrub, £5.50, before adding moisture with Vaseline Spray & Go Moisturiser Aloe Fresh, £4.99.
And when it comes to her highlighted locks, the yummy mummy uses Baylis & Harding Great Hair with Moroccan Oil Extract Shampoo and Conditioner, £6 each, available in store at ASDA, along with thirst-quenching treatments by Kérastase.
We also spoke to the model's facialist Lee Garrett - skin guru to the stars on Harley Street - who gave us some easy tips for skin as flawless as Katie's.
"Katie is very good at looking after her skin and I have been working with her over the last year on bespoke facials," says Lee.
"To achieve flawless skin and avoid stretch marks, my advice is to make sure you moisturise and keep your skin hydrated. Drinking water is very important and always take off your make-up, otherwise you will block your pores."
What do you think of Katie's product picks? Let us know by commenting below as the best comment across the site each week wins £50!
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