I haven't read this but it is on my list...I love chicklit! Or anything by Jennifer Weiner would also work (she wrote the book which inspired the film "In Her Shoes"...
have you read anything from the Shopaholic series?
Have you read any of the following:
* The Devil Wears Prada* Everyone Worth Knowing* The Nanny Diaries* Can You Keep a Secret* The Undomestic Goddess
If not, read them - I highly recommend!