Kelsey Martinovich and Amanda Ware went through mixed emotions
Presenter Sarah Murdoch announced that Kelsey Martinovich had scooped the title when Amanda Ware, 18, had actually received the most public votes.
After over a minute of thinking she was a winner, Kelsey was interrupted during her acceptance speech by the apologetic host.
‘I'm so sorry, this was a complete accident,' said Sarah, 38.
‘The lead kept changing. It was literally down to a couple of votes. It kept going back and forwards... and we ended up with Amanda as a winner.'
Kelsey, 19, appeared to take the news well.
‘It's OK, it's an honest mistake,' she said.
Australia's Next Top Model bosses have given Kelsey $25,000 (£15,162) and a free trip to New York to make up for the gaffe.
SEE VIDEO Australia's Next Top Model host announces wrong winner...
