Teen Mom 2 star Chelsea Houska is expecting her third child!

Chelsea and her husband Cole DeBoer announced Thursday on Instagram they'll be welcoming another little bundle of joy into their family soon.

"GUESS WHAT! A sweet baby girl will be joining the DeBoer clan in a few short months!" the 26-year-old MTV star captioned a photo of her ultrasound. "We could not be more excited!"

Cole shared the same photo on his own Instagram account with the following caption: "This proud dad is getting a new Bow and it's nailed my heart."

Chelsea and Cole are already parents to Watson Cole, who was born in January 2017. And the reality TV star is also mom to eight-year-old Aubree, whom she welcomed with her ex-boyfriend, Adam Lind.

Chelsea and Cole tied the knot in October 2016, while she was pregnant with their first child together.

Once the couple announced their big news, Chelsea's supportive father Randy Houska -- who often appears on Teen Mom 2 -- posted on Twitter, "I would like official recognition from @ChelseaHouska that @ritahouska and I are the most awesome secret keepers #BOOM #1moreDeBoer."

And Randy isn't the only person celebrating this pregnancy, as Chelsea's Teen Mom 2 co-star Kailyn Lowry congratulated her on social media.

"Welcome to the moms of 3 club @ChelseaHouska @TM2LeahDawn," Kailyn tweeted, giving a shout-out to Leah Messer.

Kailyn clearly left their fellow Teen Mom 2 original castmate, Jenelle Evans, out of the tweet. Kailyn, Leah, and Jenelle each have three children of their own.

Chelsea and Cole, a fitness enthusiast, met at a gas station in 2014 and got engaged in November 2015.

After getting married, Chelsea wrote on Twitter, "So as most of you already know, yesterday Cole and I got married in a tiny ceremony just with our parents and siblings. Next year, once our baby is here and able to be part of it, we will have a big ceremony and reception with our friends/extended family."