"He's so happy. I think it's the sense of the relief from all of the amazing support he's felt," Kim says. "It's a really brave thing to come out and be so truthful. And to have all of that support meant the world to him, and our family."
Kim says she offered Jenner some style advice, and apparently warned him away from trying to poach her stylists.
"I said, 'The only thing is, whatever you do, do not steal my glam team. They are mine!'" she says with a laugh.
Kim continues, "I said, 'Whatever help you need, you have to look and feel your best. And if you need help with anything, style-wise, glam-wise, I'm here to help you.'"
Jenner wasn't the only man in Kim's life she dished about during her interview. She also opened up about her new mansion, and how invested husband Kanye West has become in decorating their awesome abode.
"He is so into it, it's become one of his new passions," she quips. "He literally flew to Belgium to find wood for our kitchen. And he flew to Fiji once to get fabrics. He'll fly all over the world just to find the best furniture, fabrics, and architects. He's really, really into it."
Kim spoke with ET about Jenner just moments before his interview with Sawyer aired. "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"