good book

When researching celebrities and their relationship with businesses and how they infact, become a brand themselves. I found one book particularly interesting, Idol to Icon, written by Gerrie Lim, The Creation of celebrity brands. It specifically talks about how celebrities become brands. It has many case studies of different celebrites, and is writen well.
I think it would be useful resource, if you are interested in this topic.
The book discusses the celebrity culture and asks the question " are we too obsessed with celebrities"?.It includes interveiws with people who work in different roles within the industry.
It gives a very good overall veiw of this topic.