Rob, 28, was behind the wheel while the 27-year-old sat in the passenger seat. The outing marks a rare public appearance for the reclusive Keeping Up with the Kardashians star.
A source confirmed to PEOPLE on Monday that Rob and Blac Chyna “are dating and have been for a few weeks.” While it’s unclear “how serious” the relationship is, the source said that the pair bonded over their “anger toward the [Kardashian-Jenner] girls.”
Rob, who was recently diagnosed with diabetes, found an escape from his family “nagging him about his health” and has “ignored their attempts to contact him,” the source added.
“Rob has been lonely for so long, so of course it’s great for him to spend time with someone other than his sisters,” the source said. “Rob likes her and seems to think it’s mutual.”
“Khloé feels very betrayed,” another insider told PEOPLE.
Black Chyna has a long history with the family and was once close friends with Kim Kardashian West. Things seemed to go south, however, when Blac Chyna’s ex-fiancé and father of her child, rapper Tyga, began dating Kylie Jenner.