Kim Kardashian & Kanye West -- It's a Black & White Thing!

Kim Kardashian proved she's the ying to Kanye West's yang at a fashion show in Paris this weekend ... by wearing matching black and white his and his suits.

Looking like a 21st century Annie Hall, a very serious Kim went to the dark side at the Givenchy runway show in a baby bump slimming black maternity men's suit ... while Kanye kept it virginal in a stark all white ensemble.

No shades of grey area in this relationship.