Nicholson was born in Los Angeles to actor Jack Nicholson and actress Rebecca Broussard. She was named after her father's aunt. She has a younger brother, Raymond, as well as three older half-siblings through her father; two half-sisters, Jennifer Nicholson and Honey Hollman, and a half-brother, Caleb Goddard. She was four years old when her parents separated. In 2008, she graduated from Brentwood School in Brentwood, California.