"Entertainment Tonight's" effervescent co-anchor, Mary Hart, told the Washington Post from Calgary that she is "disappointed" that CBS' plans for a TV series with her as the star have fallen through. Though Hart said she's "pressing ahead and looking at scripts right now," she also insisted that "Entertainment Tonight" is her "main job" and that she is not "one of those ungrateful, arrogant (people) who might bail out" of the program. But Hart is also rehearsing for an April 21-May 3 showroom booking at the Golden Nugget in Las Vegas. "This show is as important to me as 'Entertainment Tonight,' " Hart said. "I'm simply broadening my career, which is long overdue for me. But I don't want 'Entertainment Tonight' shunted off."