A statement issued by the Australian tour promoters has advised that the US superstar has had to postpone again "on medical advice", with details on a rescheduled date to be announced.
The singer-songwriter addressed reports of her postponing Friday's gig despite being spotted at the beach with her children.
Taking to Instagram on Friday, she wrote, "I’ve already been sick twice (kids as well) on this Australian tour, but the first time we got sick, I was able to push through.
"This time, what these parasite paparazzi don’t show you, is two doctor visits in Byron on two consecutive days, antibiotics, steroids, Vick’s, nose spray, throat spray, more steroids, NyQuil, a screaming baby in the middle of the night, every night, while mama gives him warm baths and tells her daughter everything is fine."
The post concluded, "I will see everyone [Saturday] whether I’m better or not, and the postponed show will be rescheduled. As I said, I’m sorry to the real fans who this situation has affected."