Chelsea Houska is one proud mom.
"What a life we have built," she wrote.
In another photo, Houska holds her daughter up to the camera, showing off the baby's big eyes and adorable hand mittens.
"Words cannot describe this," DeBoer commented. "Just perfect."
Houska's former Teen Mom 2 costar Kailyn Lowry chimed in, writing, "How is she that perfect? Congrats again. So happy for y'all."
Houska welcomed Walker June on Monday — which happened to also be her 4-year-old son Watson's birthday.
"Walker June 6lbs 1oz," she wrote on Instagram. "She decided she wanted to share a birthday with her big brother, Watson, and surprised us by coming last night."
Walker also joins sister Layne, 2, whom Houska shares with DeBoer. DeBoer also helps raise Houska's daughter Aubree, 11.
Houska announced last August that she and DeBoer, 32, were expecting their third child together.
She shared the news on Instagram, posting a photo of the family being showered with pink confetti with the caption: "Baby.......GIRL!!!!!!"