Kourtney Kardashian — who, with her sisters, is ninth on MTV News' list of the Women of the Year — welcomed her first child into the world on Monday. Kardashian and her boyfriend, Scott Disick, had a baby boy early December 14, E! News reports.

"Kourtney just delivered a healthy baby boy about an hour ago," her publicist said about the couple's son, Mason Dash Disick. Mason was born at an L.A.-area hospital weighing 7 pounds, 6 ounces, and measuring 19.5 inches. "A boy is definitely needed in this family!" Kourtney told E! News in October. "Scott and I are thrilled to add a little boy to the bunch."

She also spoke to Life & Style about her new life as a mom, saying that it's a very exciting time. "I'm in a new chapter of my life," she added. "It's fun!"

Initially when she announced the pregnancy, she didn't confirm the identity of the father. However, Kardashian, 30, and Disick, 26, went public with the pregnancy in August, while Kardashian was on the road promoting her show, "Kourtney & Khloé Take Miami." She later said she was surprised to find out she was having a baby. "I just kept thinking something wasn't feeling right. ... Literally, I took, like, 20 tests. I went to the doctor and he confirmed the news. I was just so shocked."

Kourtney later shared that she thought her younger sister Kim would be the first to start a family. "She definitely thought it was going to be her first. Kim has, like, every baby name picked out," the "Keeping Up With the Kardashians" star said. "Out of all of us, I was definitely the last one that was even thinking about it."