Chelsea Houska is about to become a mom for the fourth time, and her anticipation is growing by the day! The soon to be former Teen Mom 2 star is updating fans on her adorable growing baby bump via a new Instagram story. The 29-year-old shared a boomarang video on Dec. 1 where the mama to be was relaxing on her brown leather sofa at home, wearing comfy grey sweatpants and letting her bare bump breathe.