Chelsea Houska and her new husband, Cole DeBoer, have revealed the sex of their baby.

Houska announced the big news through a Sunday Instagram post.

"It's aaaaaaa..... BOY! Can't wait to add a little man to our crazy crew!" the 25-year-old Teen Mom 2 star captioned an adorable photo of herself, DeBoer and her seven-year-old daughter Aubree from a previous relationship.

In the photo, Houska and DeBoer are holding up the ends of a mini clothesline with items fit for a baby boy -- a red plaid shirt, blue jeans, brown sneakers and a beanie -- attached. Meanwhile, Aubree is clinging onto her pregnant mom's belly with a big smile on her face.

The reality TV star welcomed Aubree with her ex Adam Lind when she was a teen and starred on 16 & Pregnant.

DeBoer shared a similar picture from the photo shoot on his own Instagram account, except in this one, the couple is standing behind the clothesline and looking at each other lovingly as Aubree is tucked away in their arms.

"Introducing the most amazing man on the planet," DeBoer captioned the post on Sunday. "Our little sweetie."

Houska and the fitness enthusiast wed on October 1 after dating for two years. They announced in July that they're expecting their first child together, due in February 2017.

The newlyweds met at a gas station in 2014 and then got engaged in November 2015.