Caitlyn Jenner -- First Public Reunion With Ex-Wife #3

Caitlyn Jenner and Kris Jenner came face to face in public for the first time Friday night and it was all to celebrate their youngest daughter's birthday.

Kim uploaded the pic ... the entire Kardashian clan came together a couple days early at Nobu in Malibu for Kylie's 18th birthday. It's the first time we've seen Kris and Caitlyn together in the same room.