The chick whose giant ass made it on one of Kanye West's 'Life of Pablo' covers owes a HUGE thank you to Kim Kardashian for picking her cakes out of a lineup. The model's name is Sheniz Halil ... and she's already got a pretty solid following online ... not hard to see why. We're told his art team put a bunch of photos in front of Kim and she picked Sheniz simply because she thought she had the best butt. Thankfully, Kanye didn't question his wife's prowess.