Kensington Palace announced on Tuesday that Queen Elizabeth had passed on her patronage for the Royal Photographic Society, which she held for 67 years.
Kate, who has a passion for photography, joined a workshop where professional photographers, who are honorary Fellows with the RPS, put youngsters supported by Action for Children through their paces.
Just like any proud parent, Kate took her camera to Prince George's first day of nursery school, where she captured this image.
To celebrate the announcement, the Duchess stopped by Warren Park Children's Centre in Kingston-upon-Thames, south west London for a photography workshop run by the Royal Photographic Society and Action for Children, another of Kate's' patronages.
The Duchess of Cambridge's secret photography skills have been hiding in plain sight for years.
In April, she shared three new images of her youngest child Prince Louis playing outside their Norfolk Anmer Hall for his first birthday and new snaps of Princess Charlotte to mark her fourth birthday in May.
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The children will learn about various elements of photography such as portraits, light and colour.
She said: "He was just misbehaving and hyper and struggled with social situations but now he's so much better, it's brought us closer together and made him likeable to be around". Maybe it's in front of you, or far away but choose your subject and focus in on it", Middleton advised, adding, "Get outside with your camera as well. "George and Charlotte love it when we do that".
"Today's sessions, run by the Royal Photographic Society, highlight how photography provides a universal language for young people to express themselves and explore their thoughts and feelings".
"Her Majesty The Queen became Patron of the Royal Photographic Society, one of the world's oldest photographic societies, in 1952".
The passionate amateur photograph regularly releases pictures of her children for special occasions.