The 34-year-old reality superstar told ET that the Kardashians will indeed be watching the 20/20 episode all together as a family.
"We will, as a family, together with Bruce, we will be watching it," she confirmed, when ET caught up with her at Variety's Power of Women luncheon presented by Lifetime on Friday, where she was honored for her charity work.
"I think everybody can learn from his story and I'm excited for him to be able to share that," she said. "We all just support him 100 percent and I hate so badly when I see things like, my mom doesn't support him and this sister doesn't support -- it's all just a story people want to put out there. None of us have spoken, and we're letting Bruce talk first."
Kim stressed that family is everything when it comes to the Kardashians.
"At the end of the day, life is about being happy being who you are and I feel like we are so blessed to have the support system and the best family to really just support each other no matter what we're going through," she said.
Diane Sawyer talked to Good Morning America on Friday ahead of the big interview, echoing Kim's sentiment that she would like for Bruce to speak for himself.
"I think we can all agree that some stories should only be told by the person who lives them, and he wants to speak directly tonight, so I'm going to let him say first what he wants to say," she told George Stephanopoulos.
But she did say that the 65-year-old former Olympian is "strong," and "looking forward to the future."
Bruce's 20/20 special airs tonight at 9 p.m. ET/PT.