Emma Watson in topless shoot for Natural Beauty book

Emma Watson has posed topless for a new book celebrating the beauty of nature.

The Harry Potter actress has stripped off for snapper James Houston's upcoming photography project Natural Beauty.

In the shots, Watson is seen smeared with dirt and dripping wet as she covers her chest with her arms and clutches an orchid.

Houston has photographed several top models and A-listers holding objects such as stones and coral to show the beauty of the human form together with nature.

Christy Turlington, Adrian Grenier, Brooke Shields and Elle Macpherson are among those who feature in the book, which aims to raise funds for eco-friendly causes.