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Designer Cynthia Rowley is convinced her flagship store is haunted by the spirit of John ­Belushi.

At Moët’s US Open suite Wednesday, the fashionista was overheard saying she believes the late comic genius still hangs around his old Bleecker Street address in the West Village.

“She was saying, ‘The store used to be an apartment where [Belushi] lived while doing ‘Saturday Night Live,’” a champagne-swilling spy told Page Six.

Belushi starred on “SNL” from 1975 to 1979 before dying in 1982 at the Chateau Marmont.

Others spotted in the bubbly brand’s suite included Rowley’s Bravo-star husband, Bill Powers, Gina Gershon, model ­Julie Henderson and former ­“Dexter” star Nicole LaLiberte.