1 of 34Kate Middleton's normally so sedate and well-behaved.
But even she couldn't contain her giggles when she clapped eyes on Prince William all trussed up at a formal knighting ceremony.
Kate and Prince Harry dissolve into helpless laughter as they watch Prince William become the 1000th knight at the Order Of The Garter day ceremony in Windsor.
Even Camilla Parker Bowles is suppressing a grin, look.
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