It's been a busy week in labor and delivery room for two 'Teen Mom 2' stars. Just one day after Jenelle Evans gave birth to daughter Ensley Jolie, her co-star Chelsea Houska welcomed a beautiful baby boy, Watson Cole. Chelsea and her husband Cole DeBoer didn't waste any time showing off their new arrival — check out their son's adorable first photo below.

Both Chelsea and Cole posted the pic of their son Watson on their Instagram accounts shortly after he was born on Wednesday and it was clear that the Cole was thrilled to be a first-time father.

He captioned the photo, "Watson Cole. My heart is so full."

Radar Online reports that the baby wasn't due on Valentine's Day, February 14, but apparently, little Watson couldn't wait to meet his parents and big sister, Aubree.

Baby makes four

Watson is the couple's first son, but Chelsea's second child. She has a daughter, Aubree, 7, with her ex-boyfriend Adam Lind. Hopefully, photos of Aubree and her new baby brother will be posted on Chelsea's Instagram soon so fans can take a peek at the siblings first moments together.

Before the baby's birth, Chelsea told Radar Online that her husband and daughter were "so excited" for the baby's arrival and they both helped to get their home ready for Watson's birth.

She went on to say that both Cole and Aubree had their hands on her belly "at all times."

“Cole and Aubree are so excited," the "Teen Mom 2" star told Radar before she gave birth. “Literally, I have hands on my belly at all times." She went on to say that they've both been helping get the baby's room set up over the past few weeks and it's a good thing they were prepared since the baby arrived three weeks early.

Congrats to the new parents

Shortly after the proud parents shared a photo of their newborn baby boy, Chelsea Houska's "Teen Mom 2" co-star, Kailyn Lowry congratulated her friend, tweeting that she was "so, so happy" and "cannot wait to hold baby boy."

Fans also sent out tweets the couple, who have been married since October, wishing them well with as they start life as a family of four.

Tweet your congrats to Chelsea and Cole on Twitter (@ChelseaHouska).