has announced she's with "baby number 4" in a social media post.

Sharing a stylish silhouette of her growing , the former star told fans she and husband , 40, are expecting another child.

"Filled with joy to share that we are expecting another little girl," Snezana, 41, captioned the post.

The couple are already parents to three daughters — four-year-old Willow, two-year-old Charlie and Eve, 16, from Snezana's first marriage.

Sam shared a clip on Instagram of the couple telling their youngest daughters.

"Our 'little' family is about to become 6 with another little girl!!!," he captioned the post.

"We told Eve a couple of weeks ago but swipe across to see when we broke the news to the little girls this morning."

It was Eve who convinced her mum to go on the Aussie reality TV series The Bachelor, where Snezana won the heart of Tassie boy Sam.

The couple met on the third season of the show in 2015, getting engaged during a visit to Tasmania in December that year, when the fitness guru proposed during a walk on the east coast of the island.

They wed in 2018, in an intimate ceremony at Byron Bay's Fig Tree restaurant with Eve serving as bridesmaid and Willow as flower girl.

The couple have just moved into a new home in Melbourne to make room for their expanding brood, with Sam recently sharing a sweet photo of Willow and Charlie inside packing boxes.

"Finally all moved in to our new house. It really does feel like home," he captioned the post.