The new royal wore another dress from one of her favourite high street stores, Reiss, for the day - which became an instant sell-out as soon as it was identified.
The Duchess, teamed the chiffon 'Peacock dress' - which retails at £195 - with a cream tweed Joseph jacket, a taupe fascinator, nude LK Bennett heels and a gold box clutch - also from LK Bennett.
Her hair was pulled back into an elegant chignon, while make-up was kept natural, and added a touch of sparkle with Kiki McDonough droplet earrings.
Her Reiss frock follows on from the nude 'Shola' bandage dress which she wore to greet the Obamas at Buckingham Palace recently - which prompted a flood of people to crash the Reiss website.
Click on the gallery below to see our pick of Kate's perfect 10 style moments: