Emma Watson poses in the nude for Global Green's 'Natural Beauty'

Along with other fellow environmentalists, Emma Watson poses in saucy pictures for Earth Day. The pictures will be published in James Houston's upcoming book of photography called "Natural Beauty."

By Nardine Saad

March 22, 2013, 5:36 p.m.

Emma Watson will strip down to raise environmental awareness, even though she won't do it for the "Fifty Shades of Grey" movie.