The 2018 contest will mark Australia's fourth year of competing in the event, following a remarkable record of three top ten finishes, with Guy Sebastian's fifth place in 2015, Dami Im's second place in 2016, and Isaiah Firebrace coming ninth in the 2017 contest, which was held earlier this year in Kyiv, Ukraine.
More than 541,000 people watched Firebrace contest the grand final at 5am and another 1.1 million viewing the delayed prime time broadcast.
"Portugal is a country that has a rhythm; even when they speak, it sounds like they are singing", she said. "It shows how much the power of song can transcend differences", she declared. "I will sing my heart out for Australia, I'm so proud to be officially representing my country and a little bit nervous - mainly about the stress of the dress!"
"I'm a very competitive person when it comes to music".
Do you think Jess Mauboy is a good choice?
When Jessica Mauboy arrived in Denmark to perform at the Eurovision song contest in 2014, she knew she wouldn't be the last Australian to do so. Her songs have been streamed globally 158 million times and her videos have been viewed globally 37 million times.
An Aria award-winning performer who became the first indigenous artist to reach number one on the Australian album charts previous year, Mauboy admits that while she was "definitely barracking for my great friends" in the competition, there was "some part of me saying I would like a chance to compete".
"Hell yeah, I was jealous", she said, laughing. "But I wanted to be on that stage; I wondered if I could crash it".
"I want to keep the vibe of it being music and that being the heart of it".
She became emotional contemplating sharing the news with her family and has already started looking at flights to bring her Timorese father Ferdi and mother Therese, who is of the KuKu Yalanji tribe, to Lisbon with her.
"Having that combination, I definitely feel blessed and lucky to be worldly in that sense of knowing those two cultures, but also to really consider that and draw stories from both ends".
And shortly after the announcement on Monday, Jessica Mauboy spoke candidly with The Daily Telegraph, stating that she believes her selection will create conversation and, perhaps, some criticism.