A source tells TMZ that $50,000 was reportedly stolen last month from the star's Calabasas home.
Kourtney is said to have received the money in cash as payment for an appearance gig, and left the money in a "safe place" in her house for a couple days. When she revisited the spot in order to deposit the money... it was gone.
Sister Khloe reported on Monday night that $250,000 worth of jewelry had been stolen from her house in Tarzana. The timing leads police to believe that the two incidents are related.
Law enforcement plans to pay special attention in their investigation to people who had access to both of the Kardashian sisters' homes.