Pregnant Kim Kardashian -- Bruce Jenner's Losing It ... He's Met Kanye West A BUNCH

Bruce Jenner's memory is disappearing faster than Kim's figure ... because the Kardashian patriarch has met Kanye West SEVERAL times, despite claiming he's only met the rapper once -- and Kim is pissed at her stepdad for saying it.

We've done our research -- and came up with at least FOUR different occasions where Bruce and Kanye were both present ... Kourtney's baby shower in May 2012, a taping of "X Factor" in November 2012, a Clippers game in December 2012, and the Kardashian family Christmas party.

The photographic evidence contradicts what Bruce told Extra this weekend ... that he only met Kanye once in his entire life, saying, "[Kanye is] not around."

We're told Kim's upset with her 63-year-old stepdad ... because Bruce makes it sound like Kanye doesn't care about the family.

And here's a clue that maybe Bruce isn't so into Kanye -- back in April, 2012, he said he was "not that excited" when Kim started dating the rapper ... because he felt Kim was rushing into a new relationship too quickly after leaving Kris Humphries.