Now, it seems the answer might have been accidentally revealed by The Ellen DeGeneres Show.
"She just likes to keep a low profile", Khloe explained.
And while she is experiencing cravings, she wants to focus on "supplying her baby with the proper nutrients".
She wrote: "Bigger the hair- smaller the bump!"
Did Ellen's team just give it all away?
HollywoodLifers, are you shocked Khloe plans to have her baby in Ohio?
'I was nauseous, not feeling well and then he had to leave the country and I took a pregnancy test.
That's when Ellen went for it: "Is Kylie craving things yet?"
When the host asked her directly if her sister was also with child, Khloe responded, "What do you mean..."
Pregnant Khloe Kardashian shares wedding plans
"She must be pregnant!"
"As you know I've rushed quite a few things before", she added, alluding to the fact she married Lamar Odom after knowing him for just 30 days.
Ellen then proceeded to ask why Kylie didn't appear on the family Christmas auto. "He really is so sweet, he's been a blessing, and how excited he is makes me more excited because I think no matter how ready you are, technically ready, in your life you always make up reasons why you're not ready".
Ellen hilariously then asked for Kylie's number, as Khloe pretended not to know what it was. There's too much secrecy around it...
The 33-year-old reality star has been keeping in touch with fans since confirming her pregnancy last month, but her family has understandably known about her baby on the way for the past several months - and hasn't been keeping their opinions to themselves.
Khloé is 6 months pregnant and looking better than ever, joking with Renee that her glow is "just ferocious highlighter".
Trying not to laugh, Khloé replied: "You're so cute". "I can tell Kylie is pregnant", Ellen continued. Sample comments: "kimberly where is pregnant kylie? don't play". See more on Kardashian's pregnancy in the video below.
Someone else said: "Ellen is insane and the only one who can get away with saying that".
Kardashian explained there was a certain episode that was flawless for Kim, and she was excited to be a part of it.
Georgia LB Roquan Smith delivers late in Rose Bowl comeback
The Sooners defense allowed 144.2 yards on the ground and gave up 20 or fewer points three times in their last four games. Coach Kirby Smart said the defense "stunk it up" in the first half, but there were no dramatic changes in the second.
First supermoon of 2018 falls on New Year's Day
The full lunar disc appears 14% bigger and up to 30% brighter than a regular moon and is fantastically "super" in every way. It has been named this way because this was the time when hungry wolves howled at the Moon, according to Daily Mail.
Limbeck: It's bye, bye Vikings in the first round
TE Kyle Rudolph, bothered by an ankle injury the past three weeks, wore a walking boot in the locker room after the game. Joe Berger will move over to center from right guard and Jeremiah Sirles will replace Easton, who is out of the season.
Seoul seizes Panama vessel for alleged North Korea ties
Results of the investigation will be reported to the UN Security Council's sanctions committee, foreign ministry officials said. Earlier a foreign ministry official in Seoul had said the ship had been seized briefly by customs authorities who inspected it.
Mariah Carey gives us first meme of 2018
Thank you for acknowledging the freezing cold weather and the necessity for hot tea! Seacrest asked Carey how she felt. After the incident past year Carey was ready to redeem herself with her powerful vocals.
Amber Alert issued out of Round Rock for 2 missing children
If you have any information regarding this abduction, call the Round Rock Police Department at 512-218-5516 or local authorities. Terry Allen Miles, 44, has a long criminal history and faced jail time for second-degree murder in 2011, KPLC reports.
LG to unveil 88-inch 8K OLED display
As Engadget notes, this new TV from the company has the biggest OLED display in the world with the highest resolution. The firm said that it used OLED for its new display because it does not involve additional cost to make.