Lauren Weisberger’s best-selling novel about a young woman losing her soul at a New York fashion magazine has been turned into an agreeably shallow comedy by director David Frankel, a veteran of HBO’s equally status-driven Entourage and Sex and the City. Meryl Streep walks away with the movie as the harshly unforgiving editor of a Vogue-like glossy; Anne Hathaway (The Princess Diaries) makes a lovely mannequin as her downtrodden new assistant, a Medill grad who trades her journalistic ideals for an endless series of smashing outfits. I didn’t believe the moralism of the story arc for a second, but obviously some sort of hanger was required. With Stanley Tucci, Simon Baker, Emily Blunt, and Adrian Grenier. PG-13, 109 min.