Kris Jenner's boyfriend was leaving Tuesday's Lakers and Kings game at Crypto.com Arena in Los Angeles when he whipped out a Thompson No. 13 jersey from a bag he was holding. It was game-worn too -- Tristan handed it to him at the end of the game.
Corey made a point of showing the Kings jersey to the paparazzi ... sending the message that he's supporting Tristan in the middle of a very rough week for the NBA star -- which is kinda surprising.
CG and TT have run in the same circles for years with the Kardashians ... so there's a history here -- but, let's face it, Corey's loyalty has gotta be with Kris, and it's hard to imagine she's too happy with Tristan right now.
As you know ... Tristan revealed Monday he fathered a child with Maralee Nichols, and promptly apologized to Khloe, who he was publicly dating last year when Nichols got pregnant.