The Whoops Now singer had already postponed part of her Up Close And Personal Tour so that she could watch the trial of Conrad Murray – the doctor who is accused of causing the death of her brother Michael – but arrived back Down Under last week.
However, she had to abandon her show just 60 minutes before she was due on stage.
'Doctors have ordered Miss Jackson to undertake vocal rest for the next two days, so she can complete the 3rd and final show of her Australian tour, this Tuesday night at the Sydney Opera House,” read a statement.
'Unfortunately, there will not be a replacement concert scheduled, so all patrons will receive a full refund.'