Emma Watson has seemingly posed topless to raise awareness for the environment.
The Harry Potter star appears to have stripped off in the images, which were taken by photographer James Houston and feature in his new book, Natural Beauty, reported Just Jared.
The 22-year-old actress, who holds flowers in the pictures, tweeted: "My friend is supporting GlobalGreenUSA with his book Natural Beauty. It's out now. : )
Brooke Shields, Elle Macpherson, Christy Turlington and Entourage star Adrian Grenier are among the celebrities who also posed for James' project, and the images are set to feature in an exhibition in New York.
"This project merges my longtime interest in the human form and my passion for the natural world," said the photographer.
"Natural Beauty was created to celebrate the beauty of nature, emphasising what we still have versus what we have lost. I hope to raise environmental awareness among the younger audience through this project."
Proceeds from the book, which features 120 images of models and celebrities, will go towards supporting Global Green USA.