Reports of Khloe's pregnancy first surfaced in September 2017, and rumors swirled for months she's expecting a baby boy.
Khloe confirmed on December 20 she's going to be a mom, sharing a photo of herself cradling her baby bump.
"My greatest dream realized. We are having a baby! I had been waiting and wondering but God had a plan all along. He knew what He was doing. I simply had to trust in Him and be patient," Khloe captioned the image.
"I still at times can't believe that our love created life! Tristan, thank you for loving me the way that you do! Thank you for treating me like a Queen! Thank you for making me feel beautiful at all stages!"
Khloe is currently eight months along into her pregnancy. Tristan also has a 14-month-old son, Prince Oliver, from a previous relationship with his ex-girlfriend Jordan Craig.