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Just who is Katie Cassidy, exactly? An actress, singer, model of some sort? Right, right you are. She stars on the CW hit, Supernatural, and is the daughter of musician David Cassidy. She is friends with Lauren Conrad and has dated Jesse McCartney for a long as time. Katie Cassidy is not yet engaged, though, we don't think. Though she did like and say she was Taylor Quinn Cole in an attempt to evade an underage drinking arrest.