I guess you mean the Russel Crowe who was born in Wellington, cousin of the Crowe brothers who played cricket for NZ for many years. Given his recent antics, you can keep him.
Don't forget Phar Lap, the horse from Timaru.
Crowded House, a group based around the songwriting and vocal talents of New Zealand born lead singer, composer and guitarist Neil Finn.
Then there's the Pavlova arguement.
Dear one mention the rugby world cup? Not wanting to share with NZ last time & voting against us (for Japan) holding it in 2011.
Once Were Warriors & it's sequel starred Temuera Morrison. Great laugh when he turned up in the Star Wars prequels using a NZ accent.