April 25th 1973. Entertainer Dean Martin married his girlfriend of two years, Cathy Hawn, 25, in a small ceremony at his Hollywood home,Wednesday evening. Frank Sinatra was his best man. It was the third marriage for Martin, 55. It was Miss Hawn's second marriage, and her 6-year old daughter, Sasha, was the flower girl. The bride word a peach champaign French chiffon satin bias-cut gown with a high draped neck and a long train for the ceremony at Martin's home in the Bel Air area.