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Porsha Williams says Donna Kelce is a 'Real Housewives' stan ... telling Andy Cohen that Taylor Swift's future mother-in-law fangirled over her while on "The Traitors."
The reality TV star chatted with Andy on Wednesday's episode of "Watch What Happens Live" ... and, she says she loves the Kelce matriarch -- especially since she's such a big fan of the franchise.
Porsha says she was flattered Donna knew so much about her .