Kardashian, 28, picked up Chyna, 27, from a Texas jail last weekend after she was arrested for drug possession, and the couple has been spotted driving around Los Angeles together since.
Though most of the snapshots have shown Kardashian behind the wheel, x17 photographers snapped pictures of him getting out of his car Tuesday, giving the best look at the reality star since he was seen grabbing fast food at In-N-Out in June.
The youngest Kardashian sibling has stayed out of the spotlight for the past few years after gaining more than 100 lbs. and battling depression.
But Chyna's best friend Amber Rose has said the mother of one is having a positive influence on him.
"They're working out," she said on the podcast Allegedly last week. "Chyna's cooking healthy meals for him. It's a really, really good vibe."
For more on Rob Kardashian's relationship with Blac Chyna, her arrest and how the Kardashian-Jenner family is reacting, pick up this week's issue of PEOPLE, on newsstands Friday
Still, sources tell PEOPLE that his family remains hesistant.
At first,"it seemed Blac Chyna was really encouraging Rob to stay healthy and clean," an insider says in this week's issue. "But her arrest is changing things. The drug possession is very concerning."