Benedictine nun Mother Dolores — who stars in HBO’s short doc “God Is Bigger Than Elvis” — made a triumphant return to the Oscars last night. The former starlet who left showbiz 47 years ago to become a nun, and was an Oscar presenter in 1959, walked the red carpet in a full habit. “When the bleachers section called out to her, she put her fingers to the corners of her mouth and let out a huge whistle to the fans,” said a spy. “No one could believe such a loud sound came from the reserved Mother.”