A spokesman for FreemantleMedia, the production company behind the X Factor, described the incident as tragic.
"He collapsed late yesterday (Friday) and was treated by medics on site before being transferred by ambulance to St Vincent's Hospital."
None of the show's celebrity judges were present at the audition, which was being held to determine which contestants would appear at filmed auditions later this year.
Natalie Bassingthwaighte, Guy Sebastian, Ronan Keating and Melanie Brown are yet to confirm they will be returning to the Seven Network ratings juggernaut, which last year was won by singer Samantha Jade.
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- APNZ and Newstalk ZB