Fans and friends flooded the comment section with congratulations and heart emojis.
"Gorgeous ❤️. Congratulations!" one wrote.
"Massive congratulations B and Mark. So so gorgeous 💕💕" added another.
"And isn’t she a beauty! So much Love 💕 Crushing it Mumma x" wrote a third.
The pair announced they were expecting in August last year, both sharing an image of themselves embracing waterside, with the words ‘baby coming soon’ written in the sand at their feet.
“So … this is happening!! ❤️” Bianca captioned the image.
“Excited & maybe just a little nervous for all the new adventures 2022 will bring!!! #17weekspregnant.”
Mark posted the same cute photo, writing “+1 on the way… super excited for 2022 and adding a new member to our little gang … #duefeb.”
Bianca and Mark are best known respectively for their appearances on The Block and Married at First Sight.
Mark was paired with Ning Sura on the show, but after failing to make a connection on the 2018 season, they went their separate ways.
He announced his relationship with Bianca, who is also a former professional netball player, in January of 2019, posting a photo of the pair on his Instagram.
“When I walk beside her, I am a better man,” he captioned the image.
The couple have remained tight ever since, often featuring on each other’s social media, especially across the pregnancy.
“30 weeks in, so roughly 10 weeks till Mark gets his T-shirts back,” she joked in November, posting a snap of the pair, with Mark touching her small, burgeoning bump.
Congrats to the happy family!
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