This week, the British Royal family shared some photographs of their trip to the BHS Back to Nature Garden at the Chelsea Flower Show.
Though one tweeter was less convinced, claiming the prince simply asked: "Have you been on here?" But, instead of calling her Charlotte, William refers to her with his special nickname for his daughter - Mignonette.
And one Instagram user wrote: 'I hear the end of the question "Have you been on it?"
Princess Charlotte of Cambridge attends the Maserati Royal Charity Polo Trophy at the Beaufort Polo Club on June 10, 2018 in Gloucester, England.
Back in January, Prince George revealed his nickname is "Archie" when he struck up a conversation with a stranger on a walk with his grandmother Carole Middleton in Berkshire.
Maud is the five-year-old daughter of Lord Frederick Windsor and Sophie Winkleman. The duchess is clearly passing her green thumb on to her three children, who are bound to share their own love for nature with Prince Harry and Meghan's baby, Archie Harrison.
According to Helen McArdie, who occupied the room next to Kate Middleton's in their hall of residents, she once caught the couple in a bar with the royal prince doing something cheeky. But then we realized that the real doppelgängers in the royal family are Prince George and Prince Louis.
Louis and Charlotte also took turns on the giant rope swing, recreating Kate's pose on it from earlier this weekend.
"Twenty out of 10!" the young prince replied. "That's pretty good. I think Mummy's done well". A swing seat hanging below the garden's centrepiece, a high platform tree house, encouraging creative play and discovery for all generations. 2. George and Charlotte sat side-by-side dangling their feet into a stream - which resulted in muddy feet - and Louis ran around picking up twigs and sticks.