IS DIRTY HARRY CLEANING UP his act? Since Clint Eastwood's first marriage broke up in 1976, the 65-year-old actor has seen romances go from good to bad to publicly ugly. But last week he made the day of Dina Ruiz, 30, a TV anchor, in a small, private ceremony in Las Vegas. His fame is not a concern, Ruiz says: "I was not a huge fan, so I didn't have to deal with that hurdle." She didn't have to persuade Eastwood to get hitched. "When you're going to get married," she says, "you know." Actress Frances Fisher, mother of Eastwood's 2-year-old, wished them well. Comic Kimber Eastwood, 31, a daughter from a '60s affair, said she's happy her dad's finally committed. But actress Sondra Locke--who sued Eastwood for palimony after their 12-year affair ended in 1989--told NEWSWEEK, "I wish Dina Ruiz a lot of luck. She'll probably need it."