The former "The Real Housewives of Beverly Hills" star's daughter, Brooke Wiederhorn, recently welcomed another son, and took to Instagram late on Wednesday, April 17, to introduce the newborn to followers.
"Hunter Montgomery, thank you for making our family complete!" she wrote beside a snap of the tot being cradled by his big brother, two-year-old Hucksley. "Our hearts are so full".
The boys are Brooke's kids with her husband Thayer Wiederhorn.
Kim also shared pics of the newborn on her own Instagram account, writing, "I now have two of most amazing, beautiful, perfect grandsons in the whole world I am over joyed with gratitude & love!! There is no love like this!! I am so proud, excited, and I feel incredibly blessed I love you you all so very much."
Brooke shared the news of her pregnancy over America's Thanksgiving holiday in November (18), and Richards hosted a baby shower for her daughter in March, when her sisters Kyle Richards and Kathy Hilton - Paris' mother - were among the guests in attendance.
Brooke is Kim's daughter with her ex-husband Monty Brinson, who lost his cancer battle in 2016.