AGT grand final

July 18, 2012, 6:18 pm Georgia Main Today Tonight

There's no question that Justin Bieber's visit to Australia has been a smash hit, and tonight he plays a big part in AGT's grand final performance.

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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.

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