Kourtney Kardashian mocked sister Kim Kardashian's outfit for Met Gala after-party

Kim Kardashian and Kourtney Kardashian

Kim Kardashian was furious after sister Kourtney Kardashian mocked the creation she selected to wear to an after-party following the 2019 Met Gala.

During Sunday night's episode of Keeping Up with the Kardashians, the mother-of-four called Kourtney on FaceTime while having a fitting with Manfred Thierry Mugler for the annual fashion event.

Showing off a curve-hugging turquoise minidress that the designer had made for her, Kim joked she might sport it to her sibling's 40th birthday party, but then explained that the ensemble still needed to be altered.

"So, this will be all beaded obviously and all crystals," the KKW Beauty mogul said.

"Are you coming as Nicki Minaj?" Kourtney fired back.

"This is Cher honey," Kim answered, before the 40-year-old retorted: "I would say, is it October 31st (Halloween)?"

Later in the episode, the 38-year-old confessed she was embarrassed by her sister's reaction because she was with the Mugler design team while on the phone with Kourtney.

"I have been planning my Met look since last year and she was just so rude in front of the whole Mugler team. 'Ew! Oh my God. Is this Halloween?'" Kim said, mimicking her sister. "It's all super embarrassing and I can't even stomach it."

The pair later fell out again after Kim discovered that Kourtney's stylist Dani Michelle had been in contact with Mugler's manager, Jean-Baptiste Rougeot, in an effort to get creations from the elusive Frenchman.

"For her to not only try to use the same designer but then to be so rude, it really hit me the wrong way," Kim sighed.

© Cover Media