Olivia O'Brien (born November 26, 1999) is an American singer and songwriter based in Los Angeles. She is best known for her collaboration with gnash on the Billboard Hot 100 top 10 song, "i hate u, i love u". She has since released her debut extended play It's Not That Deep. O’Brien was born on November 26, 1999, in Thousand Oaks, California. She has been singing since she was seven years old, and taught herself to play guitar and piano.