This beautiful bird is called a Pale Headed Rosella
There are two races: one with more yellow around the neck and chest (adscitus) and the other without (palliceps).
That’s why I call this one very pale.
Palliceps live in central southern Queensland.
They are about 30 cm in size.
Pale headed Rosella’s are part of the family “White Cheeked Rosella”.
Other white cheeked Rosella’s live in the northern and eastern areas of Australia.
All the best