Getty

Cardi B is taking a page out of Taylor's Swift's playbook ... the pregnant rapper popped up at boyfriend Stefon Diggs' NFL game Sunday to cheer him on.

Cardi made her first public show of support for Diggs and his team -- the New England Patriots -- during their matchup against the Atlanta Falcons at Gillette Stadium in Foxborough, Massachusetts.

The Grammy-winning artist sat with Patriots owner Robert Kraft, 84, in his swanky VIP suite -- with photogs capturing her cheers on Diggs, a Patriots wide receiver.

When Diggs caught an 11-yard touchdown pass in the second quarter, Cardi went wild celebrating her man's big moment -- which put the Patriots up 21-3. The Pats ultimately held on to beat the Falcons 24-23.

After the win, Cardi took to X to keep the celebration rolling ... sh

See Full Page