The 33-year-old Kardashian shared her happy news in a heartfelt Instagram post that reveals her growing baby bump.
"I know we've been keeping this quiet but we wanted to enjoy this between our family and close friends as long as we could privately," she wrote. "I am so thankful, excited, nervous, eager, overjoyed and scared all in one!"
Back in October, Us Weekly received information from multiple sources confirming that the couple are expecting a boy.
The source also revealed that Khloe may not be spending Christmas with her NBA boyfriend Tristan Thompson in Cleveland, Ohio where the couple lives.
"Khloé wants to give birth in L.A. That’s the plan right now. For Christmas, Khloé wants to be with her family. Tristan has a game on Christmas Day, so they are still deciding if they will celebrate together, or apart. Either way, they are spending New Year’s together."
Now we just need one thing: confirmation that sister Kylie is pregnant too.