Kate just revealed her adorable nickname for Prince Louis

After attending the King’s Coronation ceremony on Saturday, Prince Louis missed out on the coronation concert the following day, which meant he was all the more prepared and feeling fresh for his first official engagement on Monday.

The five-year-old spent the action-packed day with the 3rd Upton Scout Group in Slough, and was joined by his parents, the Prince and Princess of Wales, and siblings, Princess Charlotte and Prince George.

It was during a sweet moment with his mother that the Princess revealed her sweet nickname for her youngest child.

While toasting marshmallows over an open flame, the Princess of Wales helped her youngest son with the task, handing him a stick to throw away, at which point she was heard saying: "Pop that in the fire, Lou Bug."

A member of the group then gave the young royal his own s’more to eat, leading the mum-of-three to remind Prince Louis: "What do you say?"

He responded shyly with a subtle smile: "Thank you." The young prince seemingly enjoyed the sweet treat, judging by his reaction.

The Princess, who is joint President of the Scout Association, and her family joined the Scouts and other volunteers as part of the Big Help Out initiative, a tribute to the King's public service encouraging people to support their local areas.

They took part in the renovation of the Scout Hut, such as sanding and painting, and assisted with resetting a path. Prince Louis also drove an excavator as he sat on his father’s lap.

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