Emma Watson poses nude for James Houston's Natural Beauty 2013 Book promoting Global Green USA.

Watson shows her sexy side as she poses in the nude for James Houston's Natural Beauty 2013 Book. The actress is seen dripping wet with her eyes closed while holding an orchid in one hand. However, a closer look at one of the behind-the-scenes picture published in a report by E! Online shows that the actress is actually not completely naked but has a skin colored wrap around her chest to cover her breasts.

The book will contain 120 images of some of the world's leading models and celebrities that are supporters of environmental awareness, including Adrian Grenier, Christy Turlington, Brooke Shields, Karlie Kloss, Elle Macpherson, Anja Rubik and Arizona Muse.

Watson took to her Twitter account to voice her support for the project.

"My friend is supporting GlobalGreenUSA with his book Natural Beauty. It's out now. : ) X," "The Perks of Being a Wallflower," the actress wrote, posting a bare-shouldered portrait of herself.

This picture proves that Hermione Granger of "Harry Potter" is not afraid to shed her girl next door looks and show her seductive side to the camera, even though she scrapped rumors of starring in the movie adaptation of E.L. James' erotic novel "Fifty Shades Of Grey."

Waston took to her Twitter account Sunday to rubbish rumors and clarify that she will not be taking on the role.

"Who here actually thinks I would do 50 Shades of Grey as a movie? Like really. For real. In real life," the 22-year-old tweeted.

The post received several replies from her fans, most of them saying they don't believe the rumors and the tweet was retweeted more than 35,000 times. After receiving thousands of responses, the actress followed her previous tweet with another tweet saying, "Good. Well that's that sorted then," with a smiley.