@kourtneykardash

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@bellahadid

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They're not ready for summer to be over!

Kim, Kourtney and Kendall called up Bella Hadid and some of their other pals to keep the Labor Day festivities going, and they hosted a backyard BBQ, complete with wine pong and vodka watermelons!

The ladies cooked up a feast in the kitchen, making everything from Kris Jenner's special guacamole to their hairstylist Jen Atkins' banana bread, all while wearing their skimpiest bikinis!

A couple of their male buddies were there, too, but noticeably absent was Bella's on-again beau The Weeknd, and Kourt's on-again beau Younes Bendjima! Oh, and Kanye couldn't be bothered to stop by, either.

If you've ever wondered how Kimmy K could possibly make eating melon look sexual, watch the below video!