Question: When was the American-born former Japanese pop singer born who was debuted in February 2003 and also a belongs to the category of  "Dekichatta kekkon"?
Sentence (from "Rio Fujii"): Rio Fujii (藤井 梨央) (born March 4, 1999) is a former Japanese pop singer, and former member and sub-leader of Japanese girl group Kobushi Factory.
Relevant evidence: No