By peoplestaff225
December 01, 2008 07:30 PM

Bradley Kanaris/Getty

Robert Clarence Irwin celebrates his fifth birthday with mum Terri and sister Bindi Sue, 10, during a party at Australia Zoo on Monday on the Sunshine Coast, Australia.

"Crocodile Hunter" dad Steve Irwin passed away in September 2006, after accidentally being pierced by a stingray’s barb.

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