Celebrity Celebrity Moms Kourtney Kardashian Welcomes Baby No. 3! By Rita Kokshanian Rita Kokshanian Rita Kokshanian is a Los Angeles-based writer and editor who covers celebrity, fashion, beauty, and lifestyle. She was previously an Assistant Editor for InStyle and is currently the Senior Copywriter at The Grind. InStyle's editorial guidelines Published on December 14, 2014 @ 07:01PM Pin Share Tweet Email Photo: Paul Zimmerman/Getty Images for Women's Health Congrats, Kourtney and Scott! The eldest of the Kardashian sisters and her longtime boyfriend have welcomed their third child--a boy. They are already parents to Mason Dash (who is celebrating his 5th birthday today) and 2-year-old Penelope Scotland. PHOTOS: Chic Celebrity Maternity Style Kardashian announced at the beginning of June that her and Disick were making their family a party of five. Since then, we haven't been able to take our eyes off of Kardashian's ever-changing, always on-trend maternity style that included everything from skimpy bikinis to figure-hugging prints. Congratulations to the growing family! PHOTOS: Kourtney Kardashian's Maternity Style