But matriarch Kris has revealed that she's "over the moon" for Khloé because she's finally in"such a great place" both professionally and personally, and couldn't be happier with basketball player Tristan.
"We love Tristan so much, and she's so happy, and she's been through so much,"Kris told ET. "Just seeing her be able to do something so creative with [her denim line] Good American—that's her passion.
"On top of it, to be in such a great place in her personal life is amazing. She's really happy. She lives most of the time now in Cleveland, so that's interesting, because she's not around every day."
When asked how 20-year-old Kylie will handle "major life changes" (in terms of managing her successful make-up line, obvs), Kris insisted Kylie is capable of taking on anything and everything.
"I think she is very strong," Kris continued. "I think the strength that she has as a woman and as an entrepreneur, a businessperson, and everything that she's got going on— she's really equipped to handle whatever comes her way. I'm so proud of that kid. She's a good girl with a big heart."
And on what advice she gives to Kourtney, Kim, or Rob in terms of juggling parenting duties with their work, Kris added: "I think they just see by example. All of us are together, so it's not like I have to sit each one down and say, 'Okay, when you grow up, or when you have a baby...' We're so involved with each other's lives that I think they see how we all manage and micromanage our lives. I taught my kids from day one, family is everything—so, that comes first.
"They've always had their priorities together and I'm proud of that. Their kids always come first, and I think that's important."