Prince Louis' adorable question for Queen Elizabeth at her final Trooping the Colour

Known for his cheeky and inquisitive attitude, the young royal left everyone gushing with his sweet reactions and expressive face.

The young prince, who was just four years old at the time covered his ears as the military aircraft roared above the senior royals and his mum Princess Kate comforted him.

Lip reading specialist Jeremy Freeman spoke to the Daily Star and said that Louis exclaimed "woah" to his mum.

Turning to his great-grandmother, Louis asked: "Are the Red Arrows coming?" To which the Queen jokingly responded: "I hope so."

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Kate Middleton has been out of the public eye recently, after stepping back from royal duties this year when she was diagnosed with cancer.

The princess has been recovering in private but there has been speculation over whether she could appear alongside her family on the balcony at Trooping the Colour this weekend.

Last week, the Princess of Wales wrote that she hopes to be back in her public role representing the Irish Guards “very soon”.

She has not confirmed whether or not she will be making an appearance at this weekend's event.

A source close to the princess told The Daily Beast that fans should not over analyse the note from the future Queen.

Another said: "I think this idea that Kate is suddenly going to pop up on the balcony on Saturday is far-fetched.

"It would be wonderful, of course, but more than slightly bizarre given that she bowed out of the colonel’s review.”

In previous years, the Kate has been accompanied by her husband, Prince William, and their three kids, Prince George, Princess Charlotte, and Prince Louis.

Speaking about the likelihood that William will bring the children, royal author Katie Nicholl told Entertainment Tonight: "They’ve been up there several times now.

"They are always impeccably behaved, often entertaining, and they always seem to enjoy it. It wouldn’t surprise me at all if William decides to bring them."

"They’re not working members of the Royal Family yet, but they will be," she continued.

"Prince George is a future king, so for the public to be able to see George, Charlotte, and Louis on occasions like this is really quite important."