NBC Sports first reported the news.
The couple began dating in middle school and got married after the 36-year-old signal-caller's freshman year at NC State. Rivers is a devout Catholic.
The couple has six girls -- Halle, Sarah Catherine, Caroline, Grace, Rebecca and Clare -- and two boys, Peter and Gunner.
Hesitant to move with eight children from their home in San Diego when the team moved ahead of the 2017 season, Rivers and Tiffany stayed put. Instead, Rivers commutes daily 90 or so miles in a customized SUV that houses a 40-inch TV capable of computer hookup so he can study film.