The much-anticipated series about Carolyn Bessette and John F. Kennedy Jr. is still months away from its Valentine’s Day premiere.

But the production crew and trucks for Ryan Murphy’s “American Love Story” has been camped out in front of Kleinfeld, the emporium for wedding dresses on West 20 th Street, in recent days. The plan is to shoot a scene of Sarah Pidgeon as the former Calvin Klein publicist and Paul Anthony Kelly as the George magazine founder en route to a charity event in a limousine. When the pair are stopped at a red traffic light and glance at a wedding dress in Kleinfeld’s windows, Bessette Kennedy’s character is said to make a comment about them getting married one day.

Although Bessette never shopped at Kleinfeld, the wedding dress that catches the character’s ey

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