Kim Kardashian doesn't wanna be photographed when she doesn't wanna be photographed ... and that means when she doesn't have her proper no-makeup look on, with full contouring and the right Kylie Lip Kit color applied.

Well we spotted Kim at the gym yesterday, analyzing her pressed juice options after a workout and here are some things we noticed ... 1) she's not sweating and 2) we've never seen her sit in this unflattering position -- we can see why she wanted to hide! But guess what, Kim, hiding your face didn't quite do trick. The hips don't lie; we know who you are by the spread of that infamous booty!