Prince Louis taunts Kate Middleton with faces

As he watched the Platinum Jubilee Pageant, Prince Louis displayed some decidedly unregal behavior.

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A video of the 4-year-old placing his hand over his mother's mouth went viral on social media.

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The boisterous lad made a series of faces, poked his tongue out, and put his thumb to his nose while wiggling his remaining fingers.

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Seeing Louis standing on his chair and throwing a cushion, Kate decided to take a break with her youngest.

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Prince William's cousin, Mike Tindall, noticed Louis' behavior.

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In addition, he gave his mum a big hug and spent some time on his grandfather's lap.

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During the Trooping the Colour ceremony on Thursday, Louis stole the show with a powerful salute.

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When the royal family gathered to wave, he barreled past 96-year-old great-grandmother for a prime viewing position.

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He was photographed making an array of animated faces, including a scream, hands over his ears, and eyes closed.

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Camilla Parker-Bowles did attend the Platinum Jubilee Pageant, but this time Mum wasn't taking chances.

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The Duchess reined in her son, who resembles her late father, Michael Middleton.

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