Kim Kardashian fought gravity last night and won!

Wearing no bra and probably some strategically-placed sticky tape, Kim vamped it up for David Letterman last night -- looking sexy in a revealing, sequin-covered black dress.

Kim and Kourtney were on "The Late Show" to promote their new show, "Kim & Kourtney Take New York" -- where Kim said the two "probably gained about 10 pounds eating all the nuts on the street corners" during their time in the city!

Check out Kim and Kourtney's sexy style!

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