Rob Kardashian put his weight loss on public display in a new photo this week.

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The 29-year-old reality star showed off his slimmed-down physique in a rare full-body picture on Instagram. Kardashian captioned the shot with three train emojis.

The "Keeping Up with the Kardashians" star had lost 50 pounds as of mid-April and shared a side-by-side comparison of his progress the next month. He acknowledged there was still "a lot of work to do" but said he was glad to be "getting better."

Kardashian gained 100 pounds between 2014 and 2015 and was diagnosed with diabetes in December.

His weight loss journey began in January after he started dating Blac Chyna, whom he later credited as his "motivation."

"Rob is finally excited about life again," a source told Us Weekly magazine in June. "Chyna makes him so happy.

"It had been so long since Rob had smiled," the insider added. "Rob used to be such a goofy guy. Now that's coming back. He has a reason to smile again."

Kardashian and Blac Chyna got engaged in April and announced they're expecting their first child the next month. The couple will star on the new E! series "Rob & Chyna," from which they shared a behind-the-scenes photo last week.