The image - which appears below - sees the singer standing in front of an orange and yellow background wearing a bowler hat.
'You Bring Me Joy' is Lily's first release since finishing third on last year's X Factor UK series, behind Marcus Collins and winners Little Mix.
The song - out August 26 - was produced by pop collective Xenomania, who have previously worked with Girls Aloud, Alesha Dixon and Gossip.
The 17-year-old recently confessed that she had heard new Girls Aloud material whilst recording her new album at Xenomania's studios, adding: "I'm not telling anyone about them, it's top secret."
Listen to 'You Bring Me Joy' in full below: