Kiara Mia isn't bailing on 49ers QB Jimmy Garoppolo after one bad game, because she says he "radiates greatness" ... and you can't hold him back for long.
We got the popular porn star at the Century City Mall in L.A. Friday night and asked about Jimmy G's poor week 1 performance -- in which he threw 3 interceptions against the Vikings and lost for the first time as a starter.
She tells us it's no biggie, and we can bank on Garoppolo bouncing back Sunday against the Lions because he's a star .