Despite taking a break in 2019, Kylie and Travis remained close co-parents of Stormi and eventually reignited their romantic relationship.
Of course, the news of Kylie's pregnancy may not come as a shock to her eagle-eyed fans, who picked up on some hints that the beauty mogul might be expecting on her 24th birthday.
To mark the occasion, Kylie shared a series of photos to her Instagram donning a green dress and long pink nails. Seems normal enough, right?
Well, things got a bit interesting after Kim Kardashian posted an Instagram story in honour of her younger sister's birthday. And fans couldn't help but notice something wasn't quite adding up.
In the picture were eight cocktails, each tagged with a different member of the Kardashian-Jenner clan, including Kris, Kourtney, Kim, Khloe, Kendall and Kylie - as well as two unidentified drinks.
Kylie's hand can be seen holding the cocktail she is tagged with. Buuuuut, on closer inspection, her nails are no longer pink; they are clear with green tips.
This prompted many fans to speculate that the 24-year-old was posting old content of herself to cover up the fact she is pregnant.
After @kardashianvideo shared a TikTok video by @hfazzz demonstrating the nail-switch, users were quick to share their thoughts.
"The fact that not a single person posted a pic with her during the party is definitely suspicious," one user wrote.
"She’s doing the same patterns she did last time when she hid her pregnancy," another added.
However, some users did suggest that the multi-millionaire probably has the ability to get her nails done more than once in a day.
"It’s possible that she changed her nails for the night party," a user observed.
"I think she is pregnant I think she posts old videos of herself," a fourth noted.
WATCH BELOW: Kylie Jenner bakes Halloween Cookies with Stormi. Post continues after video...
A younger sibling is bound to be a welcome addition to three-year-old Stormi.
Kylie described her first child as the "perfect mixture" of both herself and Travis to Ellen Degeneres back in 2019.
The reality star also previously told Harper's Bazaar that she feels "pressure" to give Stormi a sibling as all her friends adore the little one.
Well, it looks like there will be another bub to love now.