Lip reader reveals Princess Charlotte's curious question to Princess Kate

A sweet exchange between Princess Charlotte and her mother, Princess Kate, during their Trooping the Colour carriage ride has has been revealed by a lip reader. 

As the Princess of Wales joined her three children-Prince George, Princess Charlotte, and Prince Louis-in the carriage procession, the family smiled and waved at cheering crowds lining the Mall on their way to Horse Guards Parade. 

Young Prince Louis delighted onlookers with his signature toothless grin. 

In a particularly charming moment, Charlotte leaned toward her mother for a brief chat, the pair seen sharing a light-hearted conversation as they rode along the parade route. 

According to expert lip reader Jeremy Freeman, Charlotte curiously asked: 'Who is it? asking about someone in the crowd, while Kate replaying. Charlotte then appeared to say: 'Oh brilliant' before the pair exchanged a giggle. 

The adorable interaction took place just before King Charles and Queen Camilla led members of the Royal Family on to the Buckingham Palace balcony for the traditional military flypast. 

The monarch was joined on the balcony by the Prince and Princess of Wales, their three children-George, Charlotte, and Louis-the Duke and Duchess Edinburgh, as well as the Duke and Duchess of Gloucester.