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'Teen Mom' couple Catelynn Lowell and Tyler Baltierra's daughter Nova is thrilled she's going to be a big sister

Seeing each other through every hardship and going through a miscarriage, Lowell and Baltierra finally have some good news for their daughter.

After announcing to the world that they are pregnant, Teen Mom's most enduring couple Catelynn Lowell and Tyler Baltierra are now breaking the big news to their three-year-old daughter, NovaLee Reign. As parents to two daughters -- Nova and 9-year-old Carolyn Elizabeth -- they earlier shared the news of Catelynn's pregnancy on Instagram.

Teasing the big news on an Instagram post, Lowell had earlier told US Weekly, "The big news is that we are expecting our rainbow baby. This baby is our rainbow after the storm. I’m super excited. It was a huge shock at first. We were not planning it, especially after the miscarriage and how I went downhill with my mental illness." She also mentioned that the couple had initially decided to wait for longer but that didn't happen. "We were using protection and everything and still got pregnant. This baby just wanted to be here. It was very unexpected.”