LOS ANGELES Taylor Swift is having a very good weekend: After the blockbuster release of her new album "The Life of a Showgirl," she triumphed at the North American box office with her special movie theater event. "The Official Release Party of a Showgirl" raked in an estimated $33 million in the Friday to Sunday period in the United States and Canada, Exhibitor Relations said. The three-day-only event, which featured the debut of her first music video from the album, behind-the-scenes footage,