Rob Kardashian's weight loss is making headlines again after his lengthy battle against weight gain and depression. Now, the 28-year-old former "Keeping Up with the Kardashians" star is slowly getting back in shape and proofs are his latest Instagram posts, which are noticeably showing his fitness commitment.

Rob Kardashian, the reclusive brother of the infamous Kardashian siblings, seemed to be planning to go back to the limelight by sharing his remarkable weight loss updates on his Instagram account. According to TMZ, Kardashian's social media post on Saturday, which was taken at a restaurant, was evident that he's lost a lot of weight.

Following his long absence, Rob Kardashian resurfaced this week as he made progress in his weight loss journey. He is currently working with Gunnar Peterson as his trainer in his goal to lose 100 pounds. Radar Online added that he's really serious about getting fit and meet a dietitian to adopt a strict meal and workout plan.

Related: Rob Kardashian Weight Loss 2015: Reclusive Reality Star Shares Slimmer Instagram Selfie After Prolonged Absence

Prior to Rob Kardashian's weight loss progress, he was able to hide himself from the prying eyes of the public for over a year while he was battling some personal issue including weight gain and depression. Now, he is appearing slimmer and happier compared to some previous sightings. In fact, his BFF and "DASH Dolls" star Malika Haqq exclusively told E! News this week that Kim Kardashian's baby bro is "doing very well" in working out and taking care of himself.

"I think Rob shares what he wants to share," Haqq said. "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 is indeed making another step further towards his gradual return on social media. However, it remains uncertain whether or not his recent Instagram selfies are just throwback pics, People noted. Well, it seemed that Rob's rigorous workouts with his siblings as his workout buddy are now paying off.

For more Rob Kardashian's weight loss stories, read here.