Olivia O'Brien (born November 26, 1999) is an American singer and songwriter.
Olivia O'Brien began her singing career after uploading her cover song on YouTube and get discovered by gnash. Then, gnash reach out to her and becomes featuring on his song "hate u, love u". The song peaked at number 10 on Billboard Hot 100. In 2017, Olivia O'Brien released her debut solo single "Trust Issue". In 2018, Olivia O'Brien finally released her debut album "UDK" and followed by released a single "I Don't Exist".