Hailey is of mixed ancestry. Her mother is a Brazilian of Italian and Portuguese descent, and her father is of English, Irish, Scottish, French, and German descent.
Hailey Bieber (née Baldwin) was born on November 22, 1996, in Tucson, Arizona, United States. She is the daughter of Stephen Baldwin and Kennya Deodato Baldwin. Eumir Deodato, a Brazilian pianist, composer, arranger, and record producer, is Hailey's maternal grandfather. Alaia Baldwin is her older sister.