Olivia Gail O'Brien (born November 26, 1999) is an American singer, songwriter, and actress. She is best known for her guest appearance on Gnash's 2016 single "I Hate U, I Love U", which peaked at number 10 on the Billboard Hot 100. Its success led her to sign with Island Records; the label released two extended plays, three mixtapes, and her debut studio album Was It Even Real? (2019). In 2024, she formed the independent label Girlhood Records and released the EPs Love & Limerence and Everywhere I Go, There I Am. O'Brien signed with Gamma for the release of her second studio album Pixie (2026).
