Kourtney Kardashian was devastated last weekend when someone broke into her home in a gated community in Calabasas, California, and stole $100,000 worth of jewellery.
But now the pregnant US reality TV star's sister and her mother, Kris Jenner, have come forward to say they think crime could have been committed by someone Khloe knows.
Speaking on Ryan Seacrest's US radio show, Khloe, 25, said: "They knew what was real jewellery and what was costume jewellery. They also knew her alarm system was down at the time."
Kris added: "We have a hunch! It was a group thing."
Kris believes the responsible party could even be associated with the family's reality show 'Keeping Up With The Kardashians' - which would have allowed them to gain intimate knowledge of Kourtney's home.
She said: "Here's the thing. We're in principal production on a reality show with cameras rolling at all times.
"So somebody had to know exactly what time to get in and get out. When cameras weren't rolling. It was just very interesting, the timing.
"They knew what they were going in for. There were laptops laying on her bed; nobody touched the laptops."
Meanwhile, Kourtney and Khloe's sister Kim has revealed she felt "honoured" to be asked to star as a guest judge on 'America's Next Top Model' and praised host Tyra Banks.
Kim - who appeared on the show on Wednesday (21.10.09) - said: "I totally look up to Tyra so I was so excited.
"I get along with her really well and I'm such a huge fan, always was.
"I watched it from the start. It teaches girls what it really takes to be a model. It's got a real excitement factor."
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