Born in 1993 or 1994, Brigette Lundy-Paine is the child of Laura Lundy and Robert Paine (both actors and directors). When Lundy-Paine was two years old, the family moved to Alameda, California. In 2012, the teenaged Lundy-Paine graduated from Encinal High School, and in 2015, from New York University. On November 8, 2019, they came out as non-binary, preferring "they/them" pronouns.
