THE country's most celebrated Kiwi, Russell Crowe, left Canberra without his Australian citizenship yesterday after a day of speculation about when he'll officially become an Aussie.

A live-to-air citizenship ceremony for the Oscar-winning actor on the eve of Australia Day was called off because formalities were not able to be organised in time.

Crowe, who was born in New Zealand, was due to officially become an Aussie at the Australia Day concert on the lawns of Parliament House in Canberra on Wednesday night.

But the ceremony - set to be telecast live on Channel 10 as part of the concert coverage - was canned at the last minute.

"The producers did look into it as part of the telecast but the Government wasn't able to facilitate the process in time," a Ten spokeswoman said yesterday.

"He's keen but they couldn't do it in time.

There are obviously certain protocols that need to be adhered to."

Crowe, who headlined the concert with his band The Ordinary Fear Of God, was spurred on by the crowd of 35,000 who chanted "go Rusty, go" to encourage him to swear his allegiance to the country he grew up in.

The Hollywood heavyweight told Ten he would officially become an Australian "within the next few weeks".

Busy Crowe left Canberra on his private plane yesterday and the aircraft is sure to get a workout in coming days.

He heads to Coffs Harbour to stage his annual seven-a-side league tournament on Saturday before racing off to Tamworth to play at the Golden Guitar Awards that night.