Host Sarah Murdoch announces wrong winner as Kelsey is dethroned minutes after her glory.
Murdoch announced 19-year-old Kelsey Martinovich as the 2010 winner only to have to apologise after admitting she had heard the wrong information in her earpiece.
Eighteen-year-old Amanda Ware had actually been voted the winner by viewers during the live broadcast.
But the error came after finale fireworks and Kelsey's thank you speech had already been given live on air.
A clearly embarrassed Murdoch struggled to explain the blunder before an audience of 2,000 at Luna Park.
"Oh my God, I don't know what to say right now," she said.
"I'm feeling a bit sick about this. No. I'm so sorry about this. Oh my God. I don't know what to say. This was a complete accident.
"It's Amanda, I'm so sorry. It was fed to me wrong. Oh God. This is what happens when you have live TV folks. This is insane. Insane, insane, insane..."
The mix up was the culmination of live voting during the finale with Murdoch given the information via an earpiece.
"It was so close, literally down to a couple of votes. And it kept going backwards and forwards and backwards and forwards. And then we ended up with Amanda as the winner," she said.
Jamie Campbell, Foxtel's director of publicity apologised to Kelsey for the bungle.
"Tonight we saw the perils of live TV. At the time of the result announcement there was a miscommunication between the broadcast truck and the stage," he said.
"Sarah handled what was a difficult situation with utmost professionalism and grace. Amanda and Kelsey were neck and neck in the voting all night.
"We apologise to Kelsey for the error, and Foxtel will be sending her to New York as well as awarding her $25,000 as a prize," he said.
Kelsey was gracious in the result backflip.
"It's fine. It's an honest mistake. It's fine," she said.
A clearly embarrassed Murdoch, also an associate producer, has generally won much praise for her hosting of the series. Three years ago former host Jodhi Meares walked out on hosting the live event the day before it went to air.