Police were called to Blac Chyna's Los Angeles home after $200,000 was stolen from her safe.
Blac's fiancé Rob Kardashian, 29, was the first to notice that the huge sum of money and several pieces of jewellery had gone missing from her Tarzana mansion over the weekend.
A source told TMZ that there were no obvious signs of forced entry and "that has led police to believe it was someone in the couple's 'inner circle".
The source added: "Signs point to the culprit being someone close to her and Rob."
Rob and Blac currently live together at the Tarzana home, ever since Rob's sister Khloe Kardashian kicked him out of her Calabasas house.
Meanwhile, this is just the latest upset for Blac Chyna after it was revealed that someone is trying to sell what they claim is X-rated footage of the model and her former fiancé Tyga - who have three-year-old son King Cairo together.
However, Chyna's lawyer Walter Mosley, says she will take legal action if it is leaked.
Blac Chyna, 27 and rapper Tyga, 26 - who started dating in 2011 after meeting at an after party for Chris Brown's 'F.A.M.E Tour' and got engaged in December 2012 - split in August 2014.
Tyga went on to date Kylie Jenner, 18, the half-sister of Chyna's former best friend Kim Kardashian West, while Chyna recently got engaged to Kim's brother Rob following a whirlwind romance.