Fifi, who also shares six-year-old daughter, Trixie with ex-partner Grant Kenny, announced last year that she was expecting her second child, revealing that the bub was conceived via IVF and an anonymous egg donor.
"A few years ago I made an appointment to see an IVF specialist, the amazing Dr Sameer Jatkar at Monash IVF, and I began an IVF journey to extend our little family," she revealed on Instagram.
"After a series of egg retrievals and freezing, last year I started the process to become pregnant via an anonymous donor. I am still pinching myself that I have been this blessed and that this little miracle is growing within me, a much wanted and longed for sibling for a very excited big sister!"
She continued: "I know the value of this miracle because I have seen first-hand the heartbreak, tears and sacrifices so many women and couples suffer on their IVF journeys and my heart goes out to those who are facing that pain and struggle."