Whoa! Kate Middleton spills Prince Louis' secret nickname!

Kate Middleton has a special nickname for her mischievous son, Prince Louis.

The Wales family went on their first outing together after the coronation of King Charles III.

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The three royal siblings joined a nationwide volunteer day to revamp a Scouts Hut in Slough.

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The family roasted marshmallows over a fire, and Kate called her son "Lou-bugs."

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Prince William joked that Louis would be quiet after eating a s'more.

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The volunteer day was part of a three-day weekend of celebrations following the coronation.

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The 3rd Upton Scouts Hut is used by various community groups, including a local mosque and senior citizens' contact group.

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