Born Jessica Ellen Cornish, she gained fame for her debut album, Who You Are, which included the song "Nobody's Perfect" and ranked #2 on the U.K. charts.
She was the odd girl out in her family, as both of her sisters were academic stars. She began her career writing songs for Miley Cyrus.
She was born as the youngest of three children to Stephen Cornish, a social worker, and Rose Cornish, a nursery school teacher. She began dating singer Luke James in 2014.
She has written songs for several artists, including Chris Brown.