The newest addition has joined the family nearly two months after Christina filed for divorce from her husband, Ant Anstead. The divorce filing followed the September news that the couple of less than two years had separated. The pair share Hudson, 1, and Christina is mom to Brayden, 5, and Taylor, 10, with her ex-husband, Tarek El Moussa.
"Ant and I have made the difficult decision to separate," Christina wrote in September. "We are grateful for each other and as always, our children will remain our priority. We appreciate your support and ask for privacy for us and our family as we navigate the future."
Following their split, Ant lost more than 20 pounds as he participated in a five-week program, which teaches newly single people to "grieve your relationship so you can let it go" and "regain your identity."
Watch the video below for more on the former couple.