HOLLYWOOD (Variety) - Helen Hunt, Whitney Houston and Sigourney Weaver have been set as presenters on the Sept. 13 Emmycast, to air live on NBC. Two-time Emmy winner Hunt, who took also the best actress Oscar this year for "As Good as It Gets,'' is again up for comedy actress honors for "Mad About You.'' Houston appeared in last season's musical remake of "Cinderella,'' which earned seven Emmy bids. Weaver is nominated as actress in the movie-miniseries category for "Snow White: A Tale of Terror.''

Also, NBC sportscaster Bob Costas has signed on as emcee for NBC's pre-show coverage of celeb arrivals at the Shrine Auditorium.