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Kate Middleton

Danny Lawson - WPA Pool/Getty Images

Kids will be kids, even in front of the royals.

Parents-to-be Prince William and the Duchess of Cambridge Kate Middleton are learning a thing or two about children these days, and even Kate's sister Pippa Middleton is getting some facetime with the younger set.

Whether its Prince William getting rejected by a 4-year-old little lady to an impromptu "I hate princesses" moment for Pippa, these are hilarious moments you don't want to miss.

Check out all of the royals funniest moments with kids!