Sonenclar was born in New York City and currently resides in Mamaroneck (village), New York. She began singing at age two, imitating several of the performers on the early years of American Idol. She took numerous singing, dancing, piano and acting classes, and one of her teachers put her in touch with a New York City talent agency, which signed her. She enjoys softball and has an older brother, Russell, who graduated from the University of Delaware. She takes piano lessons and enjoys composing songs.