Catelynn Lowell and Tyler Baltierra are expanding their family.
On tonight's all-new Teen Mom OG, viewers received a big surprise when the couple announced that they are expecting baby No. 3.
It all started when Catelynn dressed daughter Novalee Reign up in a shirt that read "I'm going to be a big sister."
"Why do we have that shirt?" a confused Tyler asked. "Because she's going to be a big sister," Catelynn added.
What came next was shock, aww and a whole lot of hugs once the realization hit that a third child is on the way.