Admit it. Even if you're aren't a self-proclaimed nail biter, from time to time, your nerves get the best of you and you attack your claws like corn on the cob. There's nothing to be ashamed of, because believe it or not, 50% of people between the ages of 10 and 18 bite their nails. I'm guilty of enaging in this bad habit along with many others like popping pimples and picking at ingrown hairs, and despite being perfectly manicured on the red carpet, celebrities bite their nails too. Take your best guess and see if you can guess which of these beauties are biters.