A number of expensive watches have been stolen from the California home of Kourtney Kardashian's ex-boyfriend Scott Disick.

Scott, a regular on family reality show Keeping Up With the Kardashians, had just jetted off to France for the Cannes Film Festival earlier this month (May16) when the thieves struck.

Police believe the theft may have been an inside job as there were no signs of forced entry at the Hidden Hills property, according to TMZ.com.

Scott, the father of Kourtney's three young kids, is known for flashing his pricey collection of timepieces, including a Rolex Yacht-Master II, valued at $32,000 , and another designer watch estimated to be worth $48,000 .

It is not yet clear how many of his watches were swiped, but sources tell the website there were "multiples worth a significant amount of money".

Scott has yet to comment on the incident.