media_removed_toofab 2013

Rob Kardashian is on a mission to lose 40 pounds after a recent weight gain ... but how much does he actually weigh right now?

The reality star revealed the number on the scale at his birthday party this weekend in Las Vegas, telling Us Magazine "I'm like 240 right now, probably 235."

The 26-year-old says he dropped 5-7 pounds last week and plans on losing the entire 40 by July 4 ... just in time for the beach!

"It's a little journey, but it's good," he told the mag.

Rob has been dropping weight with the help of The Game, who has been going to Runyon Canyon for daily hikes with a large group of friends.

It worked for La La Anthony ... we have a feeling it'll work for Rob too!

See more celeb weight loss tales above, plus check out pics from Rob's b-day weekend below. 


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