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LOS ANGELES (Zap2it.com) - The already large cast of NBC's "The West Wing" will grow by two more people next season.

Mary-Louise Parker, who had a recurring role on the show this season, and veteran actress Lily Tomlin will join the show's regular cast when the series begins its fourth season in the fall. NBC Entertainment president Jeff Zucker made the announcement Monday (May 13) at NBC's upfront presentation to advertisers.

Parker plays Amy Gardner, a lobbyist with the fictional Women's Leadership Council and a love interest for White House deputy chief of staff Josh Lyman (Bradley Whitford). Her credits include the movies "Bullets Over Broadway" and "The Portrait of a Lady" as well as the upcoming "Red Dragon."

Zucker gave no clues as to what Tomlin's role would be. The Oscar- and Emmy-nominated actress last appeared in the movie "Orange County" earlier this year.