The beef went down on the new season of "The Kardashians," which premiered Thursday -- with the 2 sisters getting into a heated argument over Kourtney's displeasure over Kim's Dolce & Gabbana collab, which mirrored the trappings of Kourtney's wedding.
It was a big issue at the end of season 3, and it still seems to be a sore subject ... while Kim claims she did everything to not rip off her sis' big day, Kourtney claimed she's "talking about the bulls*** details cause it's all your egotistical, selfish mind can think about."
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Kourt says Kim spoiled the mood at her and Travis' 2022 wedding, complaining all day long. Kourtney says she's only happy when she gets "the f*** away" from her family, "Specifically you."