The couple are said to have paid a trip to the Wild Life Sydney Zoo, where they made a visit to see the koalas.
According to Australia's The Daily Telegraph newspaper, the couple arrived as 'paying customers' and didn't ask for any special treatment.
Vacation time: Ashton Kutcher and Mila Kunis are currently enjoy a break in Sydney, Australia, pictured here last week in Los Angeles
'It was just the two of them and while they didn’t want any photos taken, they were very pleasant and friendly.'
The couple's secret trip Down Under was made public by Australian-based Irish singer Brian McFadden.
Quality time: The couple are said to have paid a trip to the Wild Life Sydney Zoo, where they made a visit to see the koalas
Still no divorce: Ashton and Demi Moore have still not filed papers
Local model Ruby Rose confirmed that she was also having dinner with the hot Hollywood couple.
Kutcher took 29-year-old Mila to his hometown of Cedar Rapids, Iowa, in early September to introduce her to his family.
Meanwhile, it has been reported that the Two And A Half Men star, 34, is no closer to starting divorce proceedings from Demi Moore.
Neither side have indicated to their lawyers that they want to file papers, according to TMZ.
And apparently the pair have not even started to discuss the division of assets, the website reports, contrary to reports they are haggling over money.
The couple separated in November 2011 after six years of marriage.