Rob Kardashian hid behind the wheel but still looked liked he gained more weight as Kris Jenner's son's workout plan seemed to have boomeranged when the sock mogul was spotted early this week.

The last time Rob Kardashian was pictured was in July after he went into hermit mode following the weight gain reports. But MailOnline published photos of the sock mogul while driving around LA.

"The brother of the famous Kardashian sisters, who has been battling with his weight for some time, was dressed in a baggy black T-shirt as he was pictured through the window of his Mercedes SUV," it said. "In October this year, the family's personal trainer Gunnar Peterson revealed that Rob had been 'working out all week', but he still appears to be battling with his weight."

Gunnar Peterson, Kris Jenner's son coach, said earlier that Rob Kardashian has been doing his work in the gym and the reality star will only look at this year and laugh when the time comes that he sheds his weight.

"I'm never disappointed by Rob, there's a certain ebb and flow to people's lives and his is magnified. Rob's back on his path and he's been working out all week. It's just a blip in the radar. He'll look back on this year and say, 'Oh remember when I got fat?'" he said.

"He'll be right back on it, he's still so young. Yo-yo dieting is unhealthy for sure but Rob's always been in good shape, his work ethic is second to none," the personal trainer said.

Kris Jenner also said of her son Rob Kardashian's weight gain in one of the episodes of "Keeping Up with the Kardashians": "Sometimes you just want to fix Rob and you just can't. I have not, not cried myself to sleep in so long, I don't even know what that's like. I go to bed every night worried about him. It's like the worst feeling in the world when one of your kids isn't in a good place."