Kim Kardashian got candid about her brother, Rob, while speaking to Rolling Stone.

Is Rob Kardashian's Weight Gain Jeopardizing His Health?

As Rob does his best at remaining hidden from the spotlight, his sister, who is currently expecting her second child with husband Kanye West, put him on blast.

“It’s not that mysterious, what’s happening with Rob. He has gained weight. He feels uncomfortable being on the show, and that’s OK,” Kardashian told the magazine, according to a report by Us Weekly on Wednesday.

Rob Kardashian Skips His High School Reunion As His Weight Becomes An Issue On 'KUWTK'

“Do I think he smokes weed, drinks beer, hangs out and plays video games with his friends all day long? Yes,” Kardashian continued.

However, when she was asked if she thought “it’s not more like hookers and meth at the Ritz,” she insisted it was not.

“No, no,” she said. “Or he’d be skinny.”

During a recent episode of Keeping Up With The Kardashians, Kardashian let her frustrations with Rob be known.

"Everyone licks Rob's ass and does whatever he says,” she vented. "It's just like, at some point you just have to give it up. We all make his life so easy.”

She later explained her harsh comments, stating, "I think I'm just more of the tough love kind of person. My personality is like, 'All right, you complain, you don't like it, get up and do something about it.’”

Keeping Up With The Kardashians airs Sundays at 9 p.m. on the E! Network.