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The feminine form of "poseur."

1893 Daily News 29 Apr. 5/1 Madame de Krudener may best be regarded as the supreme ‘poseuse’ of history. (OED)
She's such a poseuse... she scorns people for spelling "poseur" wrong. Actually, spelling it "poser" is not wrong at all, that spelling has been around since 1888.
by Missing no March 08, 2005