三佳千夏 (Miyoshi Chinatsu), born as Chigi Rumiko (千木留美子) and currently known as Tani Rumiko (谷ルミコ), is a Japanese and Korean singer. She became a member of Hello! Project in 1999, leaving in late 2000, returning to South Korea. Since her marriage in 2006 to Korean pop singer Kim Jung Min, she has been working as a talent while maintaining her blog.