Do good looking people get preferential treatment in the business world?

This question is sparked from my friend "ThaDiplomat" In a previous post Diplomat implied that if a young lady is hot, she may get preferential treatment. I wonder if critical jobs or work assignments are made frequently in the business world solely based on looks. I am sure to some degree it does, but personally I would like to think it is minimal. Hiring a secretary that is a "looker", I can see happening, but giving a "looker" a free pass to the executive ranks, I can't. I don't think it happens frequently.