The media is always promoting them, and fashion labels and companies, knowing this use celebrities to full advantage in their marketing. There are a couple of articles I’ve just read. One about the rapper Kanye West about to launch his own fashion line ( at http://923now.radio.com ) and one describing the latest clothes that Kate Middleton has worn to ( http://latimesblogs.latimes.com ). Celebrities target niche markets and are able to set trends in these markets. They are opinion leaders, and it can be very helpful to know who the opinion leaders are in the niche that you are promoting to.