Mary and Conor shared their exciting baby news with fans in October with a series of adorable photos featuring Mary's seven-year-old daughter Chanel from a previous relationship.
"I know I haven’t been active lately, so I’m happy to finally be able to share the news that me and @conorjcanning are having a baby next year," Mary captioned her post.
"We can’t wait for the newest member of our little family. @maryviturino18 and I are over the moon and Chanel is very excited to be a big sister," Conor wrote in his post.
Mum-to-be Mary has been documenting her pregnancy on social media and last month revealed that the moment it all sunk in was when Conor's mum gave them gifts for the baby.
"She gave me lots of little things for the baby but look at this one, this one I was like 'Oh my gosh I didn't know that babies were so small!'" she said in a video, holding up a tiny knitted jumper.
"I knew but I forgot because Chanel's now pretty much almost my size, but look! How cute is this?"
Mary and Chanel made the decision to move from Victoria to Conor's hometown of Hobart, Tasmania shortly after their BIP experience in Fiji.
"I was living in a small country town but I love being around the city and Tasmania is good because you get the city vibe but at the same time you get that small town vibe."
The couple also hinted that they want to expand their family considerably.
"I think I've always wanted a big family, so we're both keen on the idea. We'll have to see what happens down the track!" Conor revealed.