I gave this book three stars because it really isn't bad - the plotting is good, the heroine is likeable enough, and it provides a new slant on our obsession with celebrity.
However, although the author definitely shows promise, she should work hard on her dialogue. For example, nobody says, "I am ..." or "You will ..." in an informal conversation, and although it seems trivial it really jars. The mark of a Rankin or a Hill is that the dialogue is always completely convincing and natural.
Having said that, I did enjoy the book. I'm only posting this review because its greatest flaw seems "fixeable"; if this was ironed out, I would look forward to the next one.