(written from a Production point of view)
Johnston was born as Jillian Gay Johnston in Rockwell, Texas and portrayed background and supporting characters in the drama All Ages Night (2008), the comedy Tropic Thunder (2008), the comedy Knuckle Draggers (2008), the mystery drama The Boy in the Box (2008, with Jimmy Bennett and Joanna Cassidy), and in the television series Greek, Eli Stone, True Blood, and Mad Men.
More recently, Johnston had background parts in the comedy Fired Up (2009, along fellow Trek actors Bertrand Roberson, Jr. and Tiffany Collie), the comedy drama A Thousand Words (2009), and the comedy The Devil You Know (2009).
Johnston is engaged to actor Jonathan Morrow. The couple is residing in Glendale, California.