The sisters each posted pics on their respective Instagram pages from behind the scenes at a photo shoot that they wouldn't reveal any details about - except, of course, for the fact that it was super secret!
"Major secret shoot with @KourtneyKardash," Khloe captioned this stunning photo of herself.
And Kourtney posted a pic of herself from the shoot, with a similar caption, writing, "Top secret shoot today with @khloekardashian ..."
So, all we officially know is that it's "major secret" and "top secret," which naturally makes us want to know more! And why were only Kourtney and Khloe there?! We have so many questions!
Guess we'll just have to wait and see...
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Gallery | Keeping Up With the Kardashians (and Jenners!) on Instagram