The Keeping Up With The Kardashians star, 35, hinted at heartbreak when she shared a picture which seemed to suggest she was having relationship problems with long-term boyfriend Scott Disick.
Kourtney, who is pregnant with the couple's third child, posted a picture from Disney's 2002 film Lilo & Stitch which read: "If you want to leave you can. I'll remember you, though. I remember everyone that leaves."
Alongside the sad picture, the eldest Kardashian sister posted an emoticon of a heart split in two.
Fans were quick to respond with sympathetic messages.
One wrote: "Oh no ;( I think they may be broken up."
While another replied: "I pray to the higher power that your relationship lasts with lots of communication and understanding for you both to be together to raise your beautiful children! Praying for you @kourtneykardash and @letthelordbewithyou."
Scott, meanwhile, was on a private jet to Las Vegas with his male pals and didn't respond.
Kourtney is set to give birth next month. She already has a son Mason, four, and daughter Penelope, two.
Her Instagram message coincided with the release of a trailer for her forthcoming reality TV show Kourtney & Khloé Take The Hamptons.
In the teaser posted by E! Online, the expectant mum reveals that Scott could be going to rehab.
She says: "So Scott might be going to a rehab tomorrow. First of all he's just, like, severely depressed.
"He just makes up whatever, like, pills he thinks he needs to take and then if you drink with that I don't think it's good. And just stuff like that."
According to reports at the time, Scott was allegedly admitted to hospital in June and treated for acute alcohol poisoning.
How do you interpret Kourtney Kardashian's cryptic message? Tell us in the comment box below and you could win £50!
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!