"Welcome to the world little Miss Mila-Mae Manuel ❤️ 11/11/19 7lbs ❤️ ," Davina wrote.
"I never knew a love like this existed, @jaxonmanuel and I are just absolutely smitten with you. Words can't even describe it!"
Jaxon also took to Instagram to announce the happy news.
"I love you Mila-Mae Manuel. To @davvyxx ...... you are super woman and am in awe of your courage throughout the 9 months of pregnancy . I love you. I can feel the grey hairs coming already with this one 👴🏽".
Davina and Jaxon met years before her time on the show, but rekindled their romance after MAFS aired.
In May, the pair announced they were expecting their first child.
Davina shot to fame on the fifth season of Channel 9's hit social experiment.
The brunette beauty proved divisive among Australian TV viewers thanks to her adulterous affair with co-star Dean Wells which proved to be the biggest cheating scandal of the series.
WATCH: MAFS' Davina says Jax is the love of her life