Justin Bieber has previewed his upcoming new song by singing its first line.

The Canadian is due to release fresh track 'Heartbreaker' in the near future and he has constantly been teasing the song online.

He has regularly been posting the track's artwork on Instagram and now he has uploaded a video of himself singing the song's first line.

It is unclear when 'Heartbreaker' will be released to the public, but Bieber previously hinted on Instagram that it could drop soon.

The singer's last release came in the form of stripped-back album 'Believe Acoustic', which was unleashed in January. Listen to Bieber sing 'Heartbreaker' below: