According to Us Weekly magazine, the 65-year-old star told his daughters Kendall and Kylie Jenner and step-daughters Kourtney and Khloe Kardashian and Kim Kardashian West that he was transitioning into a woman on 19 January, the same day Khloe posted a family picture on Instagram, in an upcoming episode of the reality show.
A source told the publication: "He literally started the conversation with, 'Hey, guys, I'm becoming a woman, but I'm sure you probably already figured that out.'"