Many of Delta's fans celebrated her return to social media as her last post was made back on Christmas Eve.
"Ayyy welcome back D!! We have all missed you!! Cannot wait to watch you perform!!" exclaimed one.
"OMG YESSS WE LOVEEEE!!! So happy to see you on stage!!! And with Matt too," another wrote.
However, not everyone was impressed to learn that Delta was supporting Australia Day - a polarising public holiday that has been dubbed 'Invasion Day' and 'Survival Day' by First Nations people.
"#changethedate," one person posted.
"Disappointing to see you supporting a day that persecutes our Indigenous population by its mere existence," remarked another.
"Tomorrow ought to be a National day of mourning, not a celebration. Sad you can’t see the significance for First Nations people and would support a day of celebration when it commemorates the genocide of thousands of Indigenous people and the destruction of an ancient culture and people. #changethedate," a third penned.
Delta also faced backlash for celebrating Australia Day last year when she shared a clip of herself and a group of friends sailing on Sydney Harbour.
Though many wished her a happy Australia Day and other well wishes, the Born To Try singer was criticised for celebrating on January 26th.
"Have a think about what you're celebrating," one fan wrote.
"#notadatetocelebrate," remarked another.
January 26th 2021 has seen many celebrities share messages of love and support towards Indigenous Australians.
Jesinta Franklin, Liam Hemsworth and Miranda Tapsell are just some of the local celebrities who took to social media this year.