Khloe Kardashian may be short a roomie.
Whatever's going on between the two, it's successfully irking Rob's family, who reportedly see the relationship as a manipulative power grab on Blac Chyna's part, given the depression, anxiety and health issues Rob's battled for the past year.
There's plenty of dramatic backstory between Blac Chyna and the Kardashian krewe too: She's the mother of Kylie Jenner's on-off boyfriend, Tyga (and a constant foe of Kylie's), she's best friends with Kanye West's former flame Amber Rose and she was once best buds with Kim Kardashian.
Both Rob and his possible love interest have posted about one another social media recently, with Blac Chyna sharing a photo that clearly showed Rob's tattooed arm around her as well as a Snapchat video that appears to be the couple working out on elliptical machines.
For his part, Rob joked about reports Blac Chyna's pregnant with his child, posting a pic of her with a carseat that he captioned, "Blac Chyna probably out shopping rite now as she plan to give birth to the only next generation of the Kardashian name! #Baby Kardashian."
As for their alleged cohabitation, a source tells People the situation may be more about Rob spending lots of time at his new lady's home in Thousand Oaks, Calif. -- a choice that's likely made him unwelcome at his sister's place.
"Rob likes her and seems to think it's mutual. It's just hard to take things seriously since obviously both share a lot of anger toward the [Kardashian-Jenner] girls," the insider says.
"They have both had a lot of drama with Kim. Rob really seems to get a kick out of all the drama that he is causing."