Kate Middleton, 40, is known for getting dolled up for big occasions like Trooping the Colour and movie premieres.
The Duchess of Cambridge also gets dressed up for casual events too.
Kate posted on her Twitter account this morning: “Baking cakes for the local community in Cardiff to enjoy at a Platinum Jubilee street party taking place today!”
The images showed Kate baking with Prince George, Princess Charlotte and Prince Louis.
The Duchess looked beautiful in a Brora gingham ruffled Chelsea collar shirt, which is exclusively sold from John Lewis.
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The item retails for a whopping £129.
Royal fan @loveforcambridg tweeted: “Omg this is so adorable and thoughtful!
“The Cambridges are the best.”