I picked this up in the foreign language section of Blackwell's in Oxford, partly because I reckon the people who stack the shelves there know what they are doing, and partly because I liked the cover. It turns out that it is the third book in a series, but it is readable as a stand-alone work. It's somewhere on the borderline between mildly feminist mainstream fiction and chick-lit, so maybe not what I would have bought had I known, and the reviews on amazon.fr are very mixed, but I quite enjoyed it anyway.
It features the interlocking love and life stories of a bunch of rich Parisians and a few Londoners (in spite of the title, only a bit of the book is set in New York). The writing is amusing and you want to know what happens to most of the central characters. But some of the peripheral figures are caricatures and one of the main characters is seriously unbelievable, verging on the ridiculous. The book tends to read as a treatment for a glossy soap ("Sex dans la Ville" meets "Dynastie") complete with plot improbabilities and sudden deaths (somebody in one of the earlier books was eaten by crocodiles), and I would love the series to be televised - I'm sure it would do very well.