Rob Kardashian Flaunts INSANE Weight Loss on Instagram!

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Whoa, good for you, Rob!

Rob Kardashian has lost a lot of weight in the past few months, and he's now flaunting the results on Instagram.

Yesterday, the soon-to-be papa shared a before-and-after shot of himself.

The pic on the left shows him in a heavier state while the photo on the right depicts him today.

The phrase "BlacChynarmy" is written across the pic, crediting the transformation to Rob's fiance Blac Chyna.

Rob Kardashian weight loss

"LOL‼" he wrote in the caption, along with several laughing, crying and thinking emojis (which we're not sure how to interpret).

"Still got a lot of work to do and weight to lose but glad I'm getting better :):):)" 

We're glad for you, Rob.

Over the past few years, the lone Kardashian brother had gained 100 pounds and become a recluse, worrying his friends and family.

Late last year, he was diagnosed with diabetes.

While his mom Kris Jenner and sisters tried to get him on a healthy diet and exercise plan, the sock designer was not responsive.

Luckily, he found his motivation when he began dating Blac Chyna in January.

She served as his workout buddy and prepared nutritious meals for him, and the effort has obviously paid off.

Sources say Rob wants to get in tip top shape for his wedding later this year.

Rob and Blac became engaged in April and announced her pregnancy about a month later.

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