Princess Kate used some secret signals to keep her children in check during today's "Trooping the Colour," a body language expert said.

There are three certainties in life: death, taxes, and Prince Louis acting like a ham at major royal events. To help Prince Louis, as well as Prince George and Princess Charlotte, through the struggles of public behavior that all parents face (although it is doubtful that most parents do so on the world stage), the Sun reports that his mother, Princess Wales, apparently has a secret signal.

The three Welsh children, Kate, and Queen Camilla attended Prince Charles' first annual public celebration of the monarch's birthday, Trooping the Colour, in a carriage. (Trooping the Colors is held annually in June, but the monarch's birthday is often not in that month. For example, Prince Charles' birthday is in November, and the late King's birthday is in April. (The UK generally has a milder climate, so June is preferred.)

Judy James, a body language expert, says, "Kate's firm but subtle cues keep the children enthusiastic, and in Louis' case, excited. They are able to catch the secret cues," she said. She beamed with pride as Louie began to mimic playing the drums with the band in the carriage." When she spoke to the children, there were several gestures that instructed them on when to wave their hands. There was also a gesture of holding out both hands, which usually meant a rather stern message about when to stop and what not to do."

The three children first rode in the "Trooping the Colors" carriage procession last year, when the late Queen was celebrating her Platinum Jubilee. This year, James said, Kate "placed her hand in a secluded spot in the carriage to pantomime the "stop" or "end" sign to them, as if to warn them where the boundary line was.

As at the coronation and at the funeral of His late Majesty last September, Charlotte was joined by her mother to prevent her brothers from disrupting the line.

"Charlotte told Louis to sit down, and Kate leaned over to straighten his tie. 'It's so sweet how quickly he responds to commands from his sister. The moment Charlotte told Louis to sit down, he did so immediately, without a word of objection or rebuttal. Back in the carriage, Charlotte treated Louis the same way she had treated Kate. As Louis sat between the two siblings, Charlotte watched Kate carefully, and when Kate leaned over to speak to her little son, Charlotte immediately motioned with one hand for him to give up his seat.

The five Welsh family members in the parade, including Prince William, then appeared on the famous Buckingham Palace balcony alongside the King.

[14] "On the balcony," James said, "I watched Kate and William encourage the three children as a team and perform gestures and rituals of reward." Louis excitedly turned to his mother during the flypast, and his actions were rewarded with a beaming smile from her and a gesture of loving approval as she stroked his hair."