The actress told the New York Daily Newsthat she suffers from trichotillomania.
Trichotillomania is an "often chronic impulse control disorder, more present in women than men, that leads sufferers to break off their hair." Munn said that hers manifests itself towards the hair on her face.
She admitted, "I don't bite my nails, but I rip out my eyelashes. "It doesn't hurt, but it's really annoying. Every time I run out of the house, I have to stop and pick up a whole set of fake eyelashes."
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CHECK IT OUT: Bizarre mental disorders: HERE