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Rob Kardashian, Kim Kardashian

Jason LaVeris/Getty Images

Kim Kardashian is opening up about brother Rob Kardashian.

In an exclusive preview clip from this Monday's upcoming episode of Today, Matt Lauer asks the 34-year-old Keeping Up With the Kardashians star about the ongoing private struggle her little brother has been going through.

"I think he's just going through a phase where he's not comfortable in his own skin," Kim says. "And he is working really hard to get back to where he really wants to be."

"All kids, as you put it, go through phases," Lauer goes on. "But is his phase being exacerbated by the fact that he is part of this very public, very famous family?"

"I don't necessarily think it's because of the fame," Kanye West's other half explains. "I think it's been circumstances in his life that he just really hasn't dealt with. Whether it's, you know, the loss of our father, or certain breakups, or, you know, he was extremely close to Lamar [Odom] and when, you know, Khloé and him broke up, that was really hard on him. So I think it was a couple things."

Earlier this month on Keeping Up With the Kardashians, the family revealed their worries for Rob during a very personal on-camera moment. "I feel like if I don't help him do something drastic, that he's gonna die," Kris Jenner said. "He's gained over 100 pounds in the last year...He doesn't go out of the house. He's missed Christmas, he missed Kim's wedding."

"He obviously has some kind of depression," Kim chimed in.

"Everyone's been overcompensating for him since my dad died cause he was 16," Kourtney Kardashian added.

(E! and Today are both part of the NBCUniversal family)

Watch a brand new Keeping Up With the Kardashians this Sunday at 9/8c on E!