Dang, Duchess!

Kate Middleton helped Queen Elizabeth kick off the Diamond Jubilee tour at St. Pancras train station in London on Thursday -- and dazzled royal watchers in one of her most show-stopping looks of the year.

The Duchess of Cambridge, 30, flashed her legs and seemingly perfect figured in a ladylike, 1930s-inspired teal suit by LK Bennett (designer of her beloved, frequently-worn nude pumps) with a tiered structure and a belted waist plus a James Lock hat.

Kate and the Queen, 85, provoked good-natured melee among royal watchers at the train station; the Diamond Jubilee marks the Queen's 60 years at the throne.

Prince William is currently completing his duty in the Falklands.

Tell Us: What do you think of Kate's look?