Kendall Jenner accepts her "heart dropped" when she saw Caitlyn

Kendall Jenner has opened up about the first time she saw Caitlyn Jenner dressed as a woman.

The Keeping Up With The Kardashians star, 21, spoke to Harper's Bazaar about how she struggled to come to terms with her dad's transition.

The model explained she saw plenty of clues before Caitlyn transitioned.

She told the magazine: "It was like an investigation for a really long time. We would find little things and think, 'This isn't normal.' For a minute, we were like, 'OK, is he cheating?' And then we'd say, 'I don't think so.’”

Kendall reveals one night she went down stairs to the kitchen and found her dad dressed as a woman.

"My heart dropped,” she said. "That's when she would dress as herself, at four in the morning, before we would get up. So that was like, 'Whoa,' for a second.”

Kendall added to the magazine: "When she told us, and told us that it was going to be a real thing, it was an emotional couple of months.