Brooke announced the happy news in a post on Instagram on April 18. "Hunter Montgomery, thank you for making our family complete!" Brooke gushed in the caption to the adorable photo, which shows her eldest son, Hucksley, holding his new little brother. "Our hearts are so full."
Brooke and her husband, Thayer Wiederhorn, who she wed in August 2014, previously celebrated Hucksley's second birthday last September.
The couple announced they were expecting their second child when they revealed Brooke's baby bump on Instagram while wishing their followers a happy Thanksgiving last November.
Kyle shared an update on her relationship with her sisters in Tuesday night's episode of RHOBH. "I guess the one good thing that came out of American Woman not getting picked up for a second season is my sisters and I are all speaking again, which makes me feel very happy," she shared. "Everything is good, we're spending time together, we're laughing, and having fun again."
In fact, Kyle ran into both Kim and Kathy while out to dinner with the rest of the 90210 squad in Tuesday night's episode of RHOBH. She gave them each a big hug and a kiss during the sweet moment.
See what's in store for the rest of this season of RHOBH, below.