Katie Rost has a baby on board, and The Real Housewives of Potomac alum is gleefully documenting the growth of her lil' bun on Instagram. First, Katie gave us a peek at her bare baby bump in a cropped t-shirt. Next, the model showed off her suddenly heart-shaped belly button. (Aww!) Then, on February 3, the Potomac beauty revealed just how much her baby has grown. 

Wearing a pink bra, Katie clutched her beautiful bump and wore a facial expression of playful shock. "My belly is getting so big [it's] making my eyes cross," she wrote. Katie's long hair also hung down to her shoulders in a sleek curtain, and her makeup-free skin glowed.