Anne Heche
Anne Heche claims she was abused by her father, who died of AIDS. Someone’s an alcoholic–if the abuse if true, her father; if not true, her (false accusations are an all-but-certain indication of alcoholism). She admits to using Ecstasy in her autobiography and her husband details several incidents in which he claims she was drunk and belligerent. She was found under the influence in 2001 on a farm near Fresno, obviously confused, thinking aliens were coming to take her to heaven.
She’s likely an alcoholic. Like Patty Duke, it may have triggered what appear to be Personality Disorders, but the alcoholism almost always comes first.