When your hair is as consistent (and enviable) as Kate Middleton’s, even the slightest change to your signature look can cause a stir.

On December 3, Catherine, Princess of Wales, and her husband, Prince William, 43, made an appearance at Heathrow Airport to welcome German President Frank-Walter Steinmeier and the First Lady of Germany, Elke Büdenbender, for a state visit.

Typically, the 43-year-old royal wears her hair in a deep side part with soft curls falling down her shoulder or pulled back into a low bun. On this outing, however, Princess Kate’s chestnut brown hair was completely straight and worn tucked behind her ears.

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