No matter what happens on "Monday Night Football" ... 49ers D-lineman D.J. Jones is still winning -- 'cause the guy proposed to his GF before the game -- AND SHE SAID YES!!!
The scene was amazing ... just an hour or so before Jones' Niners squared off with the Browns -- he decided to pop the surprise question to his girlfriend, Kayla Fannin.
Jones told her to look up at the sky ... and when she turned her head, the 24-year-old quickly got down on one knee.
When she turned back around .