Kim Kardashian posts a photo of her mom with pre-transition Caitlyn Jenner

Kim Kardashian posted a photo of family matriarch Kris Jenner with her mom's husband at the time, Bruce Jenner, now known as Caitlyn Jenner.

The photo, posted a couple of days ago without commentary, just "TGIF," has people talking. Caitlyn Jenner (who hasn't posted anything since before Kim's photo went up) was featured in an E! series called "I Am Cait" but it was canceled after two seasons.