Karen Lee Orzolek (born November 22, 1978),better known by her stage name Karen O, is a South Korean-born American singer and musician. She is the lead vocalist for American rock band Yeah Yeah Yeahs. 　　O is best known as the lead vocalist for the band Yeah Yeah Yeahs. She has also been noted for her sense of fashion, wearing ostentatious outfits made by her friend, fashion designer Christian Joy. In the early days of the band, she became well known for her outrageous antics during live shows. Their first ever gig was opening for The White Stripes.