Kate Spotted in Topshop

Move over Hermione - it looks like Kate's been working her magic again! The Duchess of Cambridge appeared in a £38 polka dot dress as she joined William and Harry for a tour of the Harry Potter studios - and now it's flying out of Topshop stores faster than you can say quidditch.

If you spot one, better buy it fast. I can just see legions of copy-Kates fighting it out between the rails over this one...