There might be an explanation for Matthew Stafford's wild interceptions Sunday night ... 'cause Paris Hilton was rocking her big ass engagement ring in a field box at the Rams game -- and that diamond was dancing!!!
Okay, so obviously, the ring had zero impact on the Rams losing big to the Tennessee Titans on Sunday Night Football ... but 40-year-old Paris had her rock on full display as she hit up SoFi Stadium with her fiancé, 40-year-old Carter Reum, to kick off their wedding week.