In this sneak peek from E! News, Kim Kardashian breaks down about how Kris Jenner is handling his transition.
At the time the clip was filmed, Bruce's interview had not yet aired and Kim, Kendall and Kylie Jenner are talking about what the interview is going to entail.
"He's going to tell his full story," Kim tells them. "At first I was like, 'I'm totally going to cry! I'm totally going to cry!' My throat was like literally burning."
"I was thinking, 'Mom this is really hard for her,'" Kim reveals, as she starts to cry. "It's so sad. She cries all the time and it makes me really sad. We should really appreciate all the things she does for us, because she does a lot."
Part one of KUWTK: About Bruce premieres tonight at 9:00 p.m. and part two follows Monday night at 9:00 p.m.
Editor's Note: Per Jenner's stated preference, Cambio will continue to refer to Bruce using male pronouns until he indicates otherwise.
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Gallery | Bruce Jenner: A Photo Timeline