There's Something About Mary star Diaz, who visited Australia Zoo in 2004 with boyfriend Timberlake, said Irwin was adored by young and old.
"Every kid was in love with the idea of being able to be him," she said.
Thousands of fans who queued overnight last week to snap up the 3,000 public tickets to the show began streaming into the zoo about two hours before the ceremony started.
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