The Flippin' El Moussas stars' son arrived Tuesday, proud father Tarek, 41, revealed on Instagram.
"Our baby boy is here 🤍 1.31.23," he wrote Thursday alongside their little one's first photo.
"Mama & baby are happy, healthy, tired but doing well. Our hearts are so happy ❤️."
In the image, which was reposted by Heather, the couple both cradle the tiny infant in their hands.
The little boy, whose face is not visible, is wrapped in a blanket with a footprint pattern on it that coordinates with his mom's nails.
The stars did not reveal their baby's name.
"I mean, just raising a newborn and for me getting to just raise a newborn — I've raised Taylor and Brayden since they were 3 and 8, and just welcoming a new little soul into the world … "
The couple also checked in with PEOPLE ahead of their Winter Wonderland-themed baby shower in November, with Tarek joking about how he planned to continue to support Heather once they brought their baby home, by "doing what I'm told."
"Whatever she needs help with, I'm there to help," the Flip or Flop alum said.
RELATED VIDEO: Tarek and Heather Rae El Moussa Are Having a Baby: 'We Weren't Expecting This!'
Tarek noted that he has also agreed to let Heather shave his chest before the baby comes.
"I think it's important for fathers to have skin-to-skin with the baby as well," Heather explained. "So I did tell him yesterday, I will be shaving his chest and he will be having skin-to-skin quality time with the baby."
The couple were in the middle of in vitro fertilization treatments, and had even scheduled a date to transfer an embryo, when they were happily surprised to learn they were expecting their first child together, they told PEOPLE exclusively in July. Later that month, they announced that they would be having a boy.
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Following the news of her pregnancy, Heather shared with PEOPLE that she is excited to display her changing body in maternity fashion.