A heads-up for fans of Katy Perry and Newcastle's own MasterChef Reece Hignell - the pair meet in tonight's episode.
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The five winning contestants from last night's mystery box challenge are cooking for immunity from Sunday's elimination.
In honour of MasterChef Australia's theme song, Hot N Cold, the judges tell the contestants they must create a dish with heat but, in a twist, their sweet or savoury dish must also include a cold element.
The woman behind the song herself strolls into the MasterChef kitchen mid-way through the cook to act as a guest judge. Hignell admits he was beside himself.
"I saw her in Newcastle for her California Dreams tour in 2011 so I was very starstruck when she started talking to me," Hignell said.
"She's so lovely and so extra but so normal. I was covered in sweat and freaking out, and I think I was swearing non-stop too."