Don’t expect a Kylie Cosmetics collab with Kendall Jenner anytime soon! Kylie Jenner dished some major Kardashian-Jenner bombshells in her most recent promotion for her lip kit collab with Kourtney Kardashian — the aptly named “Kylie X Kourt” — and there’s one sister Kylie’s not exactly fond of working with. Ironically, it’s the sister Ky has probably worked with the most, at least in the earlier moments of her career! Watch the video above to see why Kylie says Kendall is “mean.”

39-year-old Kourtney seemed to expect Kylie to say that she was the hardest to work with. “I’m not offended,” she joked in the promo video. The 20-year-old mom of infant Stormi Webster answered, “Today’s fun… but you’re a late starter. You’re more like me.” Kylie admitted that Khloé was probably the easiest, even though she’s a stickler for starting on time.

Kylie’s disdain for working with her youngest older sister, Kendall, isn’t the only thing Kylie and Kourt illuminated for fans in their latest promotion video. “You had such a direction for me in mind that when I came in, you were like ‘this is what I want for us.'” Kourtney tells Kylie about the experience of working together on a makeup line. “You would make secret changes after and then I’d come in and it’d be all different. Then we’d go over it again, make some little changes. But I think the final outcome is super cute!”

“It’s probably my favorite out of the three,” Kylie gushes, comparing it with the two other Kylie Cosmetics collaborations she’s done with her sisters Kim Kardashian and Khloé Kardashian.

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“It was the hardest but my favorite,” Kylie continued. The big reveal of Kourtney’s collaboration came just in time for the mom of three’s 39th birthday. Kylie announced the collab with a birthday message on Instagram for Kourtney. “HAPPY BIRTHDAY TO THE QUEEN!” she wrote. So excited to announce the KOURT X KYLIE collaboration. This collection gives me so much lifeeeee! 3 mini palettes & 3 of Kourtney’s signature lippies launching 4/24! Collaborating with you was so much fun! I love you!” We’re glad they had fun, but hopefully she can get along with Kendall long enough to complete a collaboration so she has one with all of her sisters!