Despite an apparent warning from sister Khloé Kardashian to "never go against the family," Rob added fuel to the fire surrounding his relationship with the 27-year-old by sharing a close-up photo of her face to Instagram on Wednesday.
Source: Rob Kardashian / Instagram
"Blac Chyna probably out shopping rite (sic) now as she plan to give birth to the only next generation of the Kardashian Name! #BabyKardashian," read the text above a photo of Blac Chyna holding a baby car seat.
A source previously told PEOPLE that Rob has been "spending a lot of time" with the model at her home in Thousand Oaks, California, as roommate Khloé probably won't welcome him back into her home given the family's strained relationship with Blac Chyna.
"They are dating and have been for a few weeks. Who knows how serious it is," the source said. "Rob has been lonely for so long, so of course it's great for him to spend time with someone other than his sisters. Rob has also found an escape from his family nagging him about his heath. He has ignored their attempts to contact him."
Blac Chyna shares a child with rapper Tyga, Rob's sister Kylie Jenner's boyfriend.
"Kylie is livid," a source told PEOPLE. "She feels super betrayed and can't understand why someone in her own family would stab her in the back like that."
Rob, who was recently diagnosed with diabetes following some significant weight gain, shares a "lot of anger" toward his sisters and "seems to get a kick out of all the drama he is causing," a source said.