A professional model at 14, she joined the Bodyshots Philippines competition and landed as 1st runner-up. It opened more doors for her in the modeling industry for years. Prieto represented the Philippines at the Miss South East Asia Peninsula International Pageant where she emerged as 2nd runner-up. In 2003, she was ventured into a major beauty contest, Binibining Pilipinas 2003 pageant. Unfortunately, although she did well in the competition, she only managed to reach the Top 12 finalists. Prieto screened as a candidate for Mutya ng Pilipinas 2003 but eventually dropped the plans after being offered exclusive starring roles contract by a then giant production outfit, Seiko Films. Prieto hold the record as 2 months from its first appearance from FHM Philippines as cover girl for November 2003.