So this is why she's such a straight edge now!

Kim Kardashian confessed on Busy Tonight that her mom Kris used to worry that she'd become "a crazy drug addict" during her wild experimenting years.

The reality star recently divulged that she was high on ecstasy when she wed her first husband Damon Thomas and when she made her famous sex tape with Ray-J, and it took pretty much everyone by surprise.

“I would tell my mom everything. We always had such a close relationship. So I would come home and be like, ‘Oh my God, Mom. I did ecstasy last night.' I remember this so clearly. She was sitting on top of the washing machine. She jumped up on it, and we were sitting in the hallway by the garage in the laundry room. She was like, ‘One day you’re not going to be able to have babies. You can’t do this. You’re going to ruin yourself,'" she revealed.

"She was so upset, and she never did drugs. So she was just so upset thinking that I was going to turn into something and be this crazy drug addict. And I was just like, ‘You know what, she’s so right. I’m so over it. This is so not me.’ And I just never did anything again," she added.

As for why she's opening up about all of this now?

"Here’s the thing. People that were close to me that obviously know that life of mine, they’re like, ‘I can’t believe you said that.’ And I was like, ‘Well, I mean, I never really hide anything.’ It’s just weird to people: I’ve done ecstasy, but I don’t drink, I don’t smoke weed, I don’t do anything. So it’s weird to have done that," she explained.

She's certainly an open book!