The socialite - who is pregnant with her first child - reportedly returned to her townhouse in Calabasas at 8.30pm on Saturday (17.10.09) with her boyfriend Scott Disick to discover the building had been broken into and jewellery worth thousands of dollars was missing.
According to gossip website TMZ, Police have confirmed the 30-year-old beauty is missing a Cartier watch worth $30,000, Scott's expensive Rolex timekeeper and several diamond-encrusted accessories, including hoop earrings.
It is believed some vintage jewellery items given to her by her late father Robert Kardashian - who died of cancer in September 2003, aged just 59 - have also been taken from her home, which is part of a gated community.
It is reported Kourtney and Scott left the building at 7pm to go out for dinner.
When they returned shortly afterwards, they apparently grew suspicious after noticing several drawers had been left open.
Kourtney is due to give birth to a son in December.
