Meanwhile, an onlooker who spotted the pair at Hellenika restaurant in Brisbane revealed to WHO that the 34-year-old looked "happy and radiant".
“She was there with her boyfriend, they were in great spirits,” said the onlooker.
“Danielle Cox and her husband were there as well. Delta was so happy, friendly and kind to other guests who asked for pictures.”
“She looked radiant and really happy.”
The pair met while touring in October 2017.
Delta told InStyle Australia last May that she intends to keep her dating life out of the public eye.
“I made a conscious decision when I was 30 that I’m not somebody who wants to talk about relationships,” she told the magazine.
“I made a (choice) that I’m not even going to comment ‘yes’ or ‘no’ … I’ve said nothing for three or four years — all I’ve kept saying is ‘I’m single and I’ll let you know when I’m in a serious relationship.’ And I will.”