Kim Kardashian gave her hubby (and us) a show, on Sunday, as the reality star showed off her incredibly-large rump in cut-offs and her barely-there back fat in a revealing crop-top.

We've seen Kim in this top before -- both times without a bra; both times, headlights on full beam.

The pair went to one of the most disgusting places you can imagine ... no, not brother Rob's apartment ... they went to get some greasy Mexican fast-food at Taco Bell! After all that hard work at the gym, Kim, is that really what you want to indulge in?!

Anyway, the lard didn't appear to go directly to KK's figure; she was sucking it all in and showing it all off.

Kanye's a lucky, lucky man ... if you like this sorta thing. In fact, he said once in an interview, "I can't be with any girl but Kim because that's the girl I look at her pictures the most, I get turned on the most." Why look at pictures when you have the real thing right in front of you!