In the sweet pic, 6-year-old Charlotte, wearing a blue T-shirt and pink bottoms, sweetly cradles a butterfly in her hands, while looking down at it in wonder.
The Duke and Duchess of Cambridge shared the pic of Charlotte, as well as two solo shots of Peacock and Red Admiral butterflies, in support of the Big Butterfly Count, which is taking place across the U.K. through Aug. 8.
The initiative aims to assess the health of the environment by counting the amount and type of both butterflies and some day-flying moths.
"@savebutterflies are encouraging us all to count these incredible creatures because not only are they beautiful creatures to be around but they are also extremely important," William and Kate explained in the caption. "Butterflies are vital parts of the ecosystem as both pollinators and components of the food chain. Hopefully you can beat last year's total, @savebutterflies."