Kim Kardashian's latest selfie is all about the butt.

The reality TV star posted a new Instagram photo from her latest trip to Mexico -- once again putting her famous curves on display in a teeny bikini that can barely contain all that booty.

"Let me sleep!!!!" she captioned the pic, which shows her reclining on a day bed.

This is hardly the first photo Kim has shared of her derriere in a bikini ... she's been on a rear end kick lately -- just look at some of the other selfies in the gallery above!

The revealing pic comes after Kim opened up about her post-baby bod and how she still wants to drop another 15-20 pounds.

"Just need to get down to my weight a few years ago. Not gonna complain anymore. Starting diet TODAY! No carbs. crazy workouts. Whos with me?" she posted earlier this month on Twitter. "ughhhh my hips & butt are huge now! they were big to begin with!"

Despite some concerns about her physique, Kim clearly has no problem showing it off, does she?

Check out more of her hottest selfies in the gallery above!

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