It's reported that Kris, 58, became a grandmother for the fourth time on Sunday, 14 December when Kourtney and boyfriend Scott Disick welcomed a baby boy into the world.
So far there's been no official word from the usually publicity-loving family about the new arrival. We can't wait to find out what he's called!
Kourtney and Scott are already parents to son Mason, five, and daughter Penelope, two. Baby number three was actually born on Mason's fifth birthday!
A source told E! - which airs the Kardashian family reality shows - that everyone was happily "freaking out" at the coincidence.
It's going to be pretty busy at the Kardashian-Jenner household this Christmas, right?!
Kris was pictured out in Los Angeles yesterday picking up some goodies from a Mexican restaurant, and looking very smart in her fitted leather trousers and black coat.
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