Kardashian, 34, in her first ever interview after Jenner, 65, declared his gender transition, said she he has found his inner peace, reported Us magazine.
"Bruce is the most honest...Just, he has the biggest heart. And I'm really happy for him that he is living his life the way he wants to live it, and that he has found inner peace and just pure happiness," Kardashian said.
"That's what life is about. I don't know what life would be like if you always felt like you weren't yourself. And I know it's not something that you or I could really fully understand, but I don't even think we have to. I think as long as he is happy and he wants to live his life, however he wants to live it, that just makes me happy, and I support him 100 percent."
Kardashian said she and including siblings Kourtney, Khloe, Kylie, Kendall, and Rob, had been talking with various LGBT organizations to address their questions.
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For example, "What do we call him? Do we say him or her? And how do we be respectful?"
"I think that everything takes time," she added. "I mean, Bruce wants us to feel as comfortable as possible and take everything at our own pace, and we love him for that, and we respect him for that...