ssica Ellen Cornish (born 27 March 1988),[2] better known by her stage name Jessie J, is an English singer and songwriter. Born and raised in London, she began her career on stage, aged 11, with a role in the West End musical Whistle Down the Wind. She studied at the BRIT School before signing with Gut Records and striking a songwriting deal with Sony/ATV Music Publishing where she wrote for artists including Chris Brown and Miley Cyrus.