Kate Middleton’s firm command to her youngest son, Prince Louis, at Trooping the Colour has been revealed by a lip reader.

Before they went back inside Buckingham Palace after the Red Arrows flypast on Saturday, the Princess of Wales made a small request to the child.

“National anthem. Louis, stand.” Middleton, 43, allegedly said to the 7-year-old, lip reader Jeremy Freeman told the Mirror.

The young prince then straightened his posture and focused on the singing of the national anthem.

Louis, notably, didn’t put his usual antics on display at the annual event to celebrate the official birthday of the British sovereign.

In previous years, he has made headlines for covering his ears, sticking out his tongue and more.

Middleton shares Louis and his siblings, Prince George, 11, Princess Charlotte, 10, with her husband, Prince William.

Her appearance at Trooping the Colour last weekend was the first time she’d been seen publicly since revealing in January that she’s in remission from cancer.

She appeared to be in great spirits Saturday morning while riding in a royal carriage during the ceremony, conversing and laughing with her children.

Middleton was spotted conversing and laughing with her kids as they made their way to Buckingham Palace.

The royal sweetly matched Charlotte for the event in aquamarine outfits.

The young girl honored her late great-grandmother Queen Elizabeth II by wearing a diamond horseshoe brooch as part of her outfit.

The late monarch, who died in September 2022 at the age of 96, reportedly gifted the equestrian fashion accessory to Charlotte before her passing because they shared a mutual passion for horseback riding.

Middleton and the kids were then joined by William, and his father and mother-in-law, King Charles III and Queen Camilla, for a palace balcony photo-op.