Kim and Kourtney served up a treat for 2-for-1 Kardashian sisters in bikinis … and Kim’s ass is back to hogging the spotlight.

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The Kardashians were down in Mexico this weekend with their gal pals — including Brittny Gastineau, Malika Haqq and Larsa Pippen — hitting the beach in some pretty revealing swimwear.

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Kim’s bikinis definitely took the cake … and provided plenty too for the paps. Kourtney, meanwhile, seemed more focused on flashing some serious underboob.

Just a healthy reminder … summer is coming.