It's not uncommon for male stars to shave their heads once their hair stops growing, but when a female celebrity gets a buzz cut, it makes headlines.
Director James McTeigue told USA Today at the time: "She knew the day was coming. I put three cameras on her, made sure the clippers weren't stuck, and then we shaved her head. She loved it and kept rubbing her head."
Portman, who was 24 when she went bald, proved that even women can rock a shaved head and look pretty sexy.
If you don't believe that bald is beautiful, take a look at the following pages (we promise you'll change your mind.)