Revealed: What Prince Louis whispered to mom Kate Middleton at Trooping the Colour

It was a mother-son moment caught on camera for the world to see.

Kate Middleton and her youngest son, Prince Louis, shared a sweet exchange at Trooping the Colour on Saturday.

The Princess of Wales — who made her first public appearance since her shock cancer diagnosis in March — arrived at Buckingham Palace in a horse-drawn carriage with her three children: Prince George, 10, Princess Charlotte, 9, and Louis, 6.

Kate sat next to her youngest son who was seen speaking with his mom while sporting an animated expression on her face.

Lip reader Gaby Lane told The Sun that little Louis mouthed the words “Look over there ma” as he pointed to crowds lined along the Mall in Central London.

“Right, look at that,” Kate replied, according to Lane.

Later, Louis had another sweet moment with Kate and his dad, Prince William, while standing on the balcony of Buckingham Palace watching a flyover performed to honor King Charles’ birthday.

Louis seemed awed by the 30 jets as they flew over the palace, which let out plumes of red, white and blue smoke.

“Papa, Papa, Papa, look at all that color!” the little prince said to William, according to lip-reading Lane.

Kate was seen smiling at her youngest son, before telling him that the planes had finally “dispersed.”

While lovable Louis usually steals the show at royal events, all eyes were on Princess Kate who appeared to be fighting fit as she continues chemotherapy treatment for an undisclosed form of cancer.