While they always maintain their royal poise in public, Kate Middleton and Prince William are only human, and they're vulnerable to the same feelings of anger and jealousy as any other married couple.

We'll never see them squabble with one another in front of the press or the peasants, but private moments are rare for the Prince and the Duchess, so they sometimes let their facades down long enough for the public to see what they're really like.

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