Justin Bieber will perform an acoustic show at Sydney Harbour in late September.

The singer will play live on a custom-made 'Bieber Island' for iHeartRadio on September 30.

The cameo performance comes as part of a promotional tour of Australia.

The Canadian will also visit Melbourne on September 27, with the overall visit set to last three days.

Bieber will be promoting his upcoming new album, which is slated for a November 13 release.

The singer recently unveiled 'What Do You Mean?' as the first single from the record.

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Watch Bieber's 'What Do You Mean?' video below: