The sisters have both recently been the victims of theft, after Khloe had over $250,000 worth of jewellery stolen from her house and Kourtney having $50,000 in cash taken from the home she shares with boyfriend Scott Disick.
According to US gossip websites, there were no signs of forced entry at the either of the properties, leading authorities to believe it was an inside job.
Another clue pointing to a possible inside job is that the thieves seem to know exactly where to find the stolen items, as in Khloe’s case only the most expensive items of jewellery were taken.
The crew of the reality show – which also stars their sister Kim – are reportedly being questioned but the police are yet to charge anyone with the thefts.
Khloe, 29, had the home she used to share with estranged husband Lamar Odom robbed last month. Kourtney, 34, had been paid cash for a personal appearance and thought she had put it in a safe place before discovering it was missing.
Meanwhile, Khloe is the latest person to be rumoured to become a judge on The X Factor.
Reports this week suggested that newly reinstated judge Cheryl was ‘desperate’ to get Simon Cowell to agree to sign up former X Factor US presenter Khloe.
Khloe and Cheryl became good friends after meeting last year, and it has been reported that Cheryl has the final say over who gets the judging job, with Simon saying: “I’m not going to sit her next to someone she hates.”