Doting dad-to-be Sam, 34, also took to his Instagram to share a touching photograph of his wife and their one-year-old daughter Willow.
"What a woman. Due TODAY and hasn’t skipped a beat. We love you Mumma ❤️" Sam captioned the cute snap of the mum and daughter.
Sam and Snez are clearly excited about welcoming a new baby into their family.
"You've never seen a 39 weeks pregnant women move sooo fast," Sam captioned the cheeky shot, while covering her modesty with a peach emoji.
The Bachelor alum met on the 2015 season of the show, and tied the knot in Byron Bay late last year.
They are now preparing to welcome their second child together - another daughter.
Snezana is also mum to daughter Eve, 14, from a previous relationship.