Rob Kardashian appears to have lost weight.

Has Rob Kardashian's Secret Weight Loss Plan Been Revealed?

On Sunday night, the former Keeping Up With The Kardashians star took to Instagram, where he shared a new selfie, and showed off what appeared to be a substantial weight loss.

"Gnight," Kardashian wrote in the caption of his slim selfie on Instagram.

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For the last couple of years, Kardashian has been living life away from the spotlight, and according to PEOPLE Magazine, he's been battling depression. Although Kardashian doesn't speak much about his ongoing issues with his weight, or his mental issues, the magazine estimated he's gained around 100 pounds in recent years.

Luckily, however, he recently got serious about weight loss.

"He’s had a professional hypnotist coming over to his house for the past couple of weeks and the results have been positive,” a source told OK! Magazine earlier this month.

He's also considering gastric bypass surgery, but “only do the lap band option if hypnosis doesn’t work first.”

“He admits he’s not in the right place mentally to live a healthy life, and that’s what’s been the problem,” the source explained. “He’s learning not to stress so much about his demons, which is why he recently posted that photo on Instagram,” citing a throwback photo Kardashian shared at the end of last month.