The couple was at the game, wearing matching George Kittle jerseys, when their date turned into an engagement celebration in the stands.
RELATED: Man proposes to girlfriend in elaborate SF Embarcadero setup on Valentine's Day
Our ABC7 News photographer captured the moment when Joe Martinez proposed to his now fiancée Leticia.
As you can clearly see in the video, she said yes!
The couple celebrated two wins - Their engagement and the game itself.
The Niners beat the Raiders in their preseason finale 34-10.
Their first regular season game is next Sunday in Detroit.
VIDEO: 49ers fans return to Levi's Stadium for 1st full capacity preseason game
Go here for the latest stories and videos about the San Francisco 49ers.