It looks like the drama really never ends when it comes to the Kardashian family. A new report says that sisters Kim, Khloe, Kourtney, Kendall and Kylie are all worried that their brother Rob might be abusing controlled substances, especially after his girlfriend Blac Chyna was just arrested for drug possession.

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According to Naughty Gossip on Tuesday, the Kardashian family are not only worried that Chyna might be a bad influence on their brother, but that the former exotic dancer might be the reason he's been acting so erratically lately.

One source told TMZ, "The same day Khloe came home from a trip and found Rob and Chyna in her kitchen--someone in the family received a call from a guy who used to party with Rob. We're told the guy is now clean and wanted them to know Rob had been calling other party friends as well, and he says Rob was trying to score drugs."

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Chyna herself was arrested for public intoxication during a flight from Los Angeles to Austin. She was apparently on her way to London; it was Rob who actually drove to Texas to not only bail her out, but bring her home as well.

So far a rep for the Kardashians has not made any comments about the report. Rob himself has also not made any public comments about his relationship with Chyna even though he's been sharing photos of her on her social media accounts.

Stay tuned with Enstars for all the latest on Rob Kardashian and Blac Chyna right here.

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Rob kardashian, Blac chyna