Kim Kardashian -- Spontaneous Yeezys Plug ... Totally Set Up

Clever girl Kim Kardashian would love us to believe she's no poser -- but the pic she posted of herself in front of Kanye West's new shoe display was the exact opposite of casual and impromptu.

What Kim's Instagram pic outside the Adidas store in SoHo Tuesday failed to show was her security guard shooing away fans ... so she could get the perfect "random" shot to shill her hubby's new line of Yeezy kicks.

Not sure why she didn't use the pic with the woman and her Marshalls bag ... but we'll respect her decision ... as a true artist.

Gotta stand by your man's brand.