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Keeping up with Rob Kardashian's weight loss!

After starting a diet and exercise plan in February, the 26-year-old reality star showed off his slimmer bod at the unveiling of his Arthur George by Rob Kardashian sock line at Neiman Marcus in Las Vegas on Saturday, May 25.

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"I still have to lose like 40 to 50 pounds believe it or not," Kardashian told Us Weekly at the event. "Six months I should be there."

In March, Kardashian told Us he weighed 235 pounds and recruited friends to join him in twice-daily workouts. On Saturday, he admitted, "That got [to be] too much . . . we do that, but I'm kind of doing my own thing with Lamar [Odom]'s trainer. He's on salary since he was 19 years old, so he works for us ... I've been spending time with him."

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To help with his weight loss, Kardashian also said he's cutting back on drinking. "I'm not really drinking out here in Vegas -- I've been here since Wednesday and I leave Monday -- that's way too long," the sock designer said. "But I'm trying to get in a healthy direction."

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In a February episode of "Kourtney & Kim Take Miami," Kardashian blamed his weight gain on his break up with Rita Ora. "It's crazy how this whole year, my whole relationship was only negative," he said. "All I did was gain f--king 40 pounds and lose so much money."


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