FIRST A RING, NOW A GRAMMY
Antonio Brown is a real-deal rapper, according to Keyshia Cole -- who tells TMZ Sports the NFL star is so good on the mic ... he could win a Grammy!
Of course, the award-winning R&B singer knows firsthand about Brown's potential ... after all, she worked with the former Buccaneers receiver on his new "Paradigm" album that dropped earlier this week.
She also performed her song with Brown on stage at Gunna's new weed strain launch in downtown L.