What's really funny about this movie is that Halle Berry's stunt double was actually a man.
That's not unknown in Hollywood. Chloe Moretz's stunt double in "Kick Ass" (2010) was an young man named Greg Townley. He can also be seen as Number 3 in this year's "I Am Number Four," where he performs his own stunts.
And you can go back to "Mary Poppins" (1964), in the scene when the female nannies in the street are picked up by the wind and blown away, one can see most of the female nannies are actually stuntmen in women's clothes.