Crystal Kay Williams (born 26 February 1986 in Yokohama, Japan) is a J-Pop singer. She is also known as "Kuri" by her fans. She is well known for her songs "Koi ni Ochitara" and "Boyfriend -part II-". She has released ten Japanese studio albums. In 2003 she released an English album called "Natural: World Premiere Album". She started singing on television commercials when she was four years old. When she was twelve she was signed to Epic Records. Kay's first album "C.L.L Crystal Lover Light" was released on March 23, 2000 when Kay was fourteen.