UPDATE: We just got the full version of Kanye's baby announcement (below) ... and it's awesome. Check it out -- when was the last time you heard Kanye so happy? The answer is never.
Kim Kardashian's got a little Kanye in her -- as in she's pregnant with Kanye West's baby ... according to the rapper

EXCLUSIVE

Kim Kardashian isn't letting a little pregnancy slow down her New Year's Eve plans ... 'cause she will be partying -- as scheduled -- in Las Vegas tonight, TMZ has learned.

Kim has been set to ring in the new year at 1 Oak on the Vegas strip -- for some time now -- and we're told nothing's

Mike Walters has been telling you for months ... that Kim and Kanye would have a baby before getting married, and soon. Well, now that it's happened, we gotta ask ...

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Kim Kardashian wasn't going out of her way to squash all those pregnancy rumors -- in fact, in hindsight ... she damn near handed the world her ultrasound.

Just last week Kim and daddy-to-be Kanye West were spotted arm in arm leaving her OB-GYN.

DUH!!

We all know the only reason a dude accompanies his lady to that doctor