Kate Middleton was kept in check by Camilla at the Order of the Garter ceremony earlier this week.
Footage appears to show the Duchess of Cambridge chatting with Queen Maxima of the Netherlands before 70-year-old Camilla reminds them to pay attention.
The Argentinian-born Queen was given a firm tap by the Duchess of Cornwall who was keen to see them keep to the schedule at St George’s Chapel in Windsor.
The Dutch royal and Kate then turned to face forward in time for the procession to begin.
As well as the Duchess of Cornwall and Sophie, the Countess of Wessex, Kate welcomed guests Queen Maxima and Queen Letizia of Spain on Monday.
They appeared all smiles as they supported their husbands, King Felipe VI of Spain and King Willem-Alexander of the Netherlands as they were officially invested Knights of the Garter by her Majesty.
Order of the Garter is a service founded by Edward III in 1348 recognising contributions to public service.
The gesture came just days after it emerged that Meghan Markle appeared to be told by Prince Harry to pay attention at Trooping the Colour last week.
The couple - who recently celebrated their first wedding anniversary - share a few words after joining the Queen to watch the traditional flyover.
Then, the Duchess turns around to Harry, who appears to tell her off.
According to lip reader Tina Lannin, Harry said: "No he hasn't. Oh fine. Turn around."
Just at this point the National Anthem begins playing.
