"DREW JAMES ROY CALLEJA 👶💙," they both wrote.
"Born 27.10.23 at 2:52am weighing 3.1kgs & 51cm long 😍 He is everything we could have ever dreamed of and we are more than OBSESSED 🥰."
According to the new parents of two, they had already noticed a strong family resemblance in their baby boy.
"He's so cute. I think he looks like me, I think he's got my big eyes," Sarah-Jane said, adding: "But then he's this tiny little baby and then he's got Tom's big button nose and it's so cute, he's all nose it's adorable."
Just days before her due date, Sarah Jane shared a hysterical pregnancy update to her social media.
"Have I lost the plot, absolutely!" Sarah shared to her Instagram, adding that she had "definitely been pregnant for far too long 😂🤰."
"This poor boy has no idea what crazy he will soon be born into! Hoping the dropping it low part will bring on labour 🤪."
The hilarious video posted to accompany the caption showed a heavily pregnant Sarah-Jane dancing around with her belly on full display (and with a face on it).
A day after sharing the video, Sarah and Tom also shared photos from their maternity photo shoot, the couple radiating happiness as they prepared to welcome the newest addition to their soon-to-be family of four.
"Thankyou @angelicajamesphotography for these amazing shots. Even though I look at some of these photos and feel self-conscious which is normal, I'm so glad I did it and have something to reflect on in 20 years 😂💜," Sarah wrote.
The couple took to Instagram in April to announce their little family of three would be growing by one.
We previously saw the couple on The Block back in November 2022 where they had a heartbreak auction night result, but five months on it seemed luck was on their side with a new baby.
"So excited to announce BABY CALLEJA no.2 is incoming October 2023," the couple wrote.
"We feel so blessed and we are already so in love."
WATCH NOW: The Block's Sarah-Jae and Tom announce their second baby. Article continues after video.
In a video shared to social media, Sarah-Jane held up the pregnancy test which displayed a faint second line, confirming her pregnancy.
"It's the faintest line, but I promise its there," Sarah-Jane said in the video.
While the young mum seemed absolutely thrilled by the news, it looked like Tom was nervous to have a second baby! However we don't doubt there is nothing but love for the new bub.
When asked if he was "excited to become a dad to two", Tom could only say "yep."
In a July of her podcast episode of I Just Can't with fellow Block star Rachel Carr, the pair discussed the pains of labour - which SJ admitted was making her a bit nervous with her second child.
"I was in so much pain, I was in so much discomfort… I was on all fours of the shower, screaming. I actually thought I was dying… I thought, 'I can't do this'," she said.
These nerves, however, are predominantly overridden with excitement. In their pregnancy reveal, the couple's first born Cleo, who would nearly be two years old, knew the baby was in "mummy's tummy".
The video also showed a clip of Sarah-Jane's ultrasound and looking at their little one for the first time.
WATCH: The Block's Sarah-Jane and Tom reveal the gender of their unborn child. Article continues after video.
Taking to their Instagram in mid-July, Sarah shared a heartwarming video of her revealing to her husband Tom the gender of their unborn second child.
In the clip, Tom unwraps a nappy to find a blue animal blankie and matching blue socks with a handwritten note from Sarah.
"I forgot to post this video I made a few weeks ago telling Tom and our family the gender of baby #2 but thought I'd share it now as this video just makes me so happy!" Sarah captioned the video.
"Tom was thrilled as was our whole family!! So special welcoming another baby into the Calleja clan 💙👶💗."
Given how absolutely adorable Cleo is, we cannot wait to see their next bub!
This article originally appeared on our sister site, Now To Love.