The Channel 7 studio has been locked down, and security beefed up, for a special performance by Bieber on Australia's Got Talent.
But it wasn't just Bieber that got the crowd going, as the finalists pulled out all stops in their battle for the $250,000 prize money and the title of this year's AGT winner.More stories from Today Tonight
- Justin Bieber reveals his grumpy side
- Final showdowns on Australia's Got Talent
- Television's top judges
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