Georgetown Cupcake has had lines out the door since opening on Valentine's Day in 2008, in a much smaller space on nearby Potomac Street. But sales have doubled since the TV show's premiere (10,000 cupcakes a day on weekends, at $2.75 a pop, $15 for six or $29 for a dozen). Crowds at the new flagship store, which opened in December, have swelled to such an extent that the sisters felt compelled to add a bouncer to their staff.
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