Fans caught a glimpse of Jesinta's bump in a recent video she filmed as part of Myer's Christmas campaign.
The model wore a loose-fitting white dress as she shared a rare glimpse inside her home as she decorated the tree for the silly season.
Big sister-to-be Tullulah even made a brief cameo and could be seen playing with various Christmas ornaments with her mum.
Jesinta confirmed her second pregnancy in October during an Instagram live session with Vida Glow founder Anna Lahey.
"It was a very big surprise for us. Tullulah will be getting a sibling at the end of March next year so she will have just turned one," the model explained.
''I'll have a 13-month and a newborn, which was very daunting at first."
It took four years for Jesinta to fall pregnant with Tullulah but she and husband Buddy found out that they were expecting just a week after Sydney Swans star Buddy travelled up to Queensland to be in the AFL hub.
"It was very hard to conceive the first time with Tullulah, and for this [pregnancy] to be such an unplanned surprise is a blessing," she said.
Jesinta and Buddy met in 2012 and tied the knot four years later in a stunning ceremony at Mount Wilson's Wildenstein Gardens in the Blue Mountains, NSW.
The rock-solid couple's bond has only strengthened since they started expanding their family.
Writing for the Sydney Swans website back in June, new dad Buddy wrote: "I appreciate my mother and all women, but the appreciation of seeing exactly what mothers do do, day in day out ... my appreciation for them is just through the roof, and especially my wife."