Toni Collette has signed on to star in Steven Spielberg's Showtime comedy pilot The United States of Tara, according to Variety.

The actress is aboard to play Tara Gregor, a wife and mother of two teenage kids who seems normal on the surface but actually suffers form dissociative identity disorder.

The dark half-hour comedy will follow Tara as she deals with her various personalities -- in the pilot, they include a teen girl and adult man -- as they emerge during times of stress.

The project came from an original Spielberg idea, his first series project for Showtime and his first comedy project in TV. Feature film screenwrite Diablo Cody (Juno) is writing.

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