Duchess of Cambridge is a high street hit at Harry Potter studios

Kate Middleton mixed high street and designer pieces for an outing in Hertfordshire today with husband Prince William.

The stunning 31-year-old mum-to-be stopped by the Harry Potter film set at the Warner Bros Studios in a ditzy £38 polka dot dress from Topshop.

Kate, who was also joined by brother-in-law Prince Harry, styled her sweet spotty skater with a cute cropped jacket by Ralph Lauren, a clutch bag and smart courts.

The Duchess of Cambridge is obviously a fan of the affordable British brand.

She dressed her baby bump in a sophisticated £42 monochrome shift from the high street chain for a children’s charity function last month.

We’re heading straight to Topshop at lunch.

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Beth Shearing