In her younger years, Annie Clark, the forty-three-year-old singer-songwriter who performs as St. Vincent, was twice mistaken for a prostitute at the Carlyle hotel. The first instance was an outgrowth of her sketchy sublet arrangement. While she lived in a rent-controlled apartment in the East Village, the man who actually held the lease led an itinerant life of luxury, staying at the Carlyle when he was in town.