With the powers no one knew were vested in her, Motown legend Diana Ross officiated at the marriage of her son Evan Ross to karaoke star Ashlee Simpson at her home in Greenwich Connecticut Sunday evening. After a whirlwind courtship, the two decided to take their careers to a new level.   An intimate group of family members witnessed the accident and Ashlee’s sister Jessica served as matron of honor. When asked to comment on the nuptials Reverend Diana Ross said “This marriage doesn’t have a prayer.”