He was being a silly kid, making hilarious faces during what was supposed to be a serious event.

Fans couldn’t get enough of his hilarious antics.

However, one question was on everyone’s mind following the scene-stealing moment.

Prince Louis posing

Why does the young boy always wear shorts?

We have the answer!

Even when attending a royal event on Christmas Eve, Louis was sporting his trademarked outfit.

Prince Louis walking

The reason Louis is always wearing shorts has a surprising answer that is drenched in English history.

Ingrid Seward, editor-in-chief of Majesty magazine, toldPeoplethat it is a tradition for young boys to wear shorts.

“Boys wear short trousers until they are 8,” she explained.

The Cambridges posing

“It is very English.”

They suddenly feel very grown up."

It’s customary for British boys to wear shorts until they reach a certain age, it turns out.

This strictly enforced dress code started during the times of breeching, which has a fascinating history.

A breeching ceremony was customary for centuries (perAtlas Obscura).

Why is this still part of the royal family’s culture?

It comes down to etiquette and tradition, Grant Harrold, an expert on the topic told the BBC.

“Thankfully in the late 19th century and early 20th century, this developed into shorts.

This tradition is carried on by the Royal Family to this very day.”