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It sounds like Rob Kardashian really is on a serious mission to get healthier!

The 28-year-old Keeping Up With the Kardashians star returned to Instagram earlier this week looking slim and happy after a long period of seclusion from the public eye. And it turns out Rob really is turning over a new leaf.

"Rob is doing very well," Rob's BFF and DASH Dolls star Malika Haqq told E! News exclusively this week. "He has been working out and taking care of himself. I think Rob shares what he wants to share. I think that's how it should be for everyone. When you're ready you post, post. When you're ready to be seen, be seen. When you don't, leave him alone."

Rob Kardashian, Instagram

Instagram; Peter Kramer/NBCUniversal Cable Entertainment

Malika's sister added Khadijah Haqq McCray, "We're really defensive about Rob. He's like a little brother."

Aw!

Earlier this week, an insider told E! News that "for the first time in a long time Rob is committed to changing his diet habits." "He's been working with a chef and doing really well" so far, they added.

Rob is also working out with trainer Gunnar Peterson. "His regimen involves more than just cardio and weights," the source dished.

Rob later added via social media that it was his love for sweet treats that caused his weight gain. "Started right here with these milkshakes hahaha... #throwbackthursday," he joked.

Watch Malika and Khadijah when DASH Dolls premieres on Sept. 27 at 10PM, only on E!