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The Canadian singer, who is currently working on her next album, was asked to replace Susan Boyle after she cancelled her appearance, allegedly due to exhaustion.
Lang told The Daily Telegraph: "To be honest, I am always so happy to be in Australia and this is a small way to say thanks to everyone who has been so supportive of me down there for the past 20 years.
"And there are some [shopping] places I need to hit that I've missed since I was last there.''
Gabriella Cilmi and John Mayer are also scheduled to perform at the Australian television event.
