How did the highest paid models became that famous?

According to forbes.com the top 5 highest paid models of 2014 are Gisele Bundchen with a model salary of $47Mln; Doutzen Kroes ($8Mln);  Adriana Lima ($8Mln); Kate Moss ($7Mln) and Kate Upton ($7Mln). How did these women made it to the top and how are they discovered?

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