However, it was tough for his ex-wife, Kris, to digest the information at first.
"I have these memories of this life and I feel sometimes like it didn’t exist,” she said through tears.
The former Olympian and Kris were married in 1991 and announced their split in 2013. Together they have two daughters, Kendall, 19, and Kylie, 17.
Kardashian, 34, tried to make her mother see things from Jenner’s point of view.
“He has to deal with this for his entire life of waking up and feeling like, 'Woah! This isn’t my body. This doesn’t feel comfortable,’” she told her mother. “That’s the only way I can kind of imagine it. And you really have to, like, let go."