Here's a publicity shot from this fall's V for Vendetta (based on Alan Moore's dark maxi-series about fascist-controlled Britain) in which Natalie Portman has shaved her head.
According to Egotastic, Portman plays a prisoner and reportedly said this about her lack of a hairdo: "Some people will think I'm a neo-Nazi, or that I have cancer, or I'm a lesbian."
Thanks to Egotastic’s Phil for the tip.