Actress Shelley Long turned down the role played by Kim Basinger in "My Stepmother Is an Alien" because she felt she couldn't live up to the many script references to a "gorgeous" woman. "I said `Gee, guys, this just ain't me.' " In her new release, "Troop Beverly Hills," she looks good, but in the manner of the rich housewife she plays. Long, who has been criticized for repeatedly playing a variant of her breakthrough role, barmaid Diane Chambers on TV's "Cheers," says she wants each role to be, at heart, a good person. "I have no desire to play a villainess," she told the New York Daily News. "Why should I spend six, nine, 12 months thinking about and feeling into a character I have no respect for? Glenn Close says she forfeited her marriage in doing `Fatal Attraction.' I'm not interested in forfeiting my marriage (to investment adviser Bruce Tyson). I've worked pretty darn hard at my marriage, thank you very much. And I'm not going to give it up for a role in a movie."