Mariah Waterfall O'Brien (born June 25, 1971)[1] is an American interior designer and former actress and model.
O'Brien was born on June 25, 1971, and raised in the small town of Dellroy, Ohio.
Her parents were hippie musicians, and her middle name Waterfall was based on the Jimi Hendrix song.
O'Brien has appeared in films such as Gas, Food Lodging, Halloween: The Curse of Michael Myers, Being John Malkovich, Diamonds, Ticker, The Mod Squad, and Some Girl.
Her television credits include Buffy the Vampire Slayer, Charmed,[citation needed] The Nanny, Once and Again and Courting Alex.