Actor Vin Diesel has posed nude in a shower for a photograph. The Guardians of the Galaxy star took to Facebook to share the black-and-white photograph of himself in a steamy shower, reports eonline.com. In the image, water falls on the 47-year-old actor's naked body, while he throws his head back. Right before sharing the snapshot, the action star was doing his part to help raise awareness for Amyotrophic lateral sclerosis (also known as Lou Gehrig's disease) that affects nerve cells in the brain and the spinal cord. (Source: IANS)