Fiona also shared a heartwarming photo of her fiancée Hayley Willis, 30, cuddling their adorable newborn.
In the snap, Hunter sleeps peacefully on Hayley's chest, as she plants a sweet kiss on the top of his head.
"My world," Fiona simply captioned the snap.
We're not crying, you're crying.
Fiona and Hayley announced their exciting baby news on Friday via Instagram where they shared a selection of heartwarming photos when Hunter officially joined the family.
"For 2 years you were a dream, over 9 months we watched you grow. In a second you stole our hearts, and showed us a love we did not know," the new mums' identical captions read.
"Introducing Hunter William Falkiner. Born 22.3.2021. 3.3kgs of baby gold. Mummy Fee & bub are doing fantastic.
"A huge thank you to our incredible OB Ellie all the wonderful midwives of SAN Maternity who helped us navigate these first few days of motherhood."
In November last year, the couple told WHO they couldn’t wait to become mothers.
“I feel amazing and so incredibly blessed because we went through a lot to get to this point,” Fiona said, referencing the IVF journey she and Hayley embarked on.
“Every day we are so thankful to be here and we can’t wait for bub to come along and to start this new chapter of our lives.”