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Cardi B and the B stands for brrrr -- the rapper was no match for the cold temperatures as she supported her man, Stefon Diggs, during his game against the Jets on Sunday ... leaving the Patriots star wondering if she bailed!!
The "Outside" rapper took shelter during the New England's 42-10 win over New York at MetLife Stadium ... where Diggs secured 101 receiving yards and one touchdown, earning himself a $500K contract bonus in the process.
Diggs, 32, wanted to celebrate with this girlfriend on the field .