On Thursday, Louis became the star of the show after being photographed making a series of faces as red arrows flew over Buckingham Palace during Trooping the Color.
The prince took his seat in the Royal Box of the mall on Sunday alongside the Duchess of Cambridge and Princess Charlotte, with Prince George and Prince William by his side.
He pointed and made an exuberant gesture throughout, constantly asking questions of his mother.
At one point, Mike Tindall, who was sitting behind Louis, made a joking gesture of “I’m looking at you” to the young prince after he put his fingers in his ears and threw a pillow at him.