Rob Kardashian has been working out again with sister Kim Kardashian West and trainer Gunnar Peterson

By Michele Corriston
Updated August 31, 2015 10:50 AM
Advertisement
Courtesy Rob Kardashian

Is Rob Kardashian having a comeback?

After avoiding the limelight for years following his more than 100-lb. weight gain and battle with depression, the reclusive reality star posted a selfie to Instagram on Sunday night. And if it’s a new picture rather than a throwback, it proves his workouts with sister Kim Kardashian West are really paying off.

In the black-and-white snapshot captioned “Gnite,” Kardashian, 28, offers a slight smile, and his face is noticeably thinner than it was the last time he was photographed – grabbing fast food from In-N-Out in Woodland Hills, California, in late June.

Over the past few weeks, he’s been Tweeting about exercising with Kardashian West, 34, and on Thursday he shared an Instagram of himself drinking a milkshake in the past, remembering how he began to pack on the pounds.

Celebrity trainer Gunnar Peterson recently told PEOPLE that Kardashian is getting fit with him again.

“Rob is always in! He’s slammed schedule-wise and still makes this work,” Peterson said. “Never worry about Rob.”