According to an insider, it was the expectant mother's decision to keep her pregnancy on the down-low.
"She's very happy about the pregnancy but doesn't want to share this with the world," the source told Us Weekly.
The insider adds that while Kylie shares errything else with her fans including BTS of her business, her relationships and, of course, her day-to-day life via Keeping Up With The Kardashians and Life of Kylie, she wants to keep this important milestone all to herself.
"She wants to keep this one aspect of her life private," the sneaky source insists.
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But although she's keeping her face hidden from the cameras and her social media, she is still pretty much living her life as normal.
The reality star has been attending all of her fam events but has cleverly hidden her bump from the cameras and according to the insider, she is also continuing to work on her business while in ~hiding~.
"She is working everyday and running her business," the source adds. "She's so busy."
Kylizzle is reportedly due next month so all will be revealed V. soon.