Duchess Camilla wows in new portrait for magazine cover which was photographed by Kate Middleton

Kate Middleton typically turns her camera on her three children, but now she has a new subject: Camilla, Duchess of Cornwall.

The 74-year-old royal guest-edited this month's edition of Country Life magazine and she knew exactly who she wanted to photograph her cover shot.

The Duchess of Cambridge was personally requested by Prince William's stepmother to take her images for the upcoming issue.

The relaxed cover shot features Camilla in the garden of her private home, Ray Mill, in Wiltshire, sitting on a bench in a blue and white floral dress and cardigan with her hands on a trug of flowers.

A behind-the-scenes shot of Kate taking Camilla's photo was also shared on the Duchess of Cornwall's Instagram.

Dressed casually in jeans and sneakers, the royal mum-of-three is seen expertly taking her shot.

"The Duchess of Cambridge took our cover images at the request of our Guest Editor and we could not be happier with the results — in fact, the set of images she took was so good that we struggled to choose only three," said Country Life’s managing and features editor, Paula Lester.

The special souvenir issue marks Camilla's 75th birthday and celebrates her passion for the countryside.

The magazine will be published on July 13.