Australian Prime Minister Kevin Rudd donned an All Black tie yesterday to honour a bet with NZ counterpart John Key on the outcome of last Saturday's Bledisloe Cup test.

Mr Key said black was a great colour for mourning, in reference to Australia's woeful sports weekend that also saw its cricket team lose the Ashes to England.

He looked forward to seeing photographic evidence of Mr Rudd's tie.

"I reckon he'll look great in it. Black is a wonderful colour, particularly if you are mourning the loss of the Ashes. They probably care more about the cricket than the rugby, I suspect."