Singer Katy Perry launched Purr, her first fragrance, in New York on Tuesday. The girl-about-town was in a pink milk truck selling scents to consumers at Greeley Square and racking up about $30,000 in just two-and-a-half hours, according to industry estimates. Perry sold 450 bottles of the 3.4-oz. size of her scent, which is priced at $65 (a 1.7-oz. version goes for $45). This came after a successful Selfridges event at Oxford Street in London last Friday, where Perry reportedly sold 70...