started with this into household names. >> doesn't he own a shirt? >> reporter: household names and wealthy heart throbs. stars robert pattinson, taylor lautner, and kristen stewart have all taken a bite out of the "twilight" phenomenon. according to "forbes" stewart and pattinson earned $12 million and $17 million respectively in the last year. a majority coming from the "twilight" movies. >> you have to realize who you are. >> reporter: if a billion dollar book-to-film franchise about supernatural teenagers sounds familiar that's because it is. "harry potter" also went from a book series to a massively successful string of movies but as rose explains, there is a big difference between these love-struck vampires and the boy wizard. >> the first three "twilight" movies cost less than $170 million to make. just for comparison's sake the last "harry potter" flick "half blood prince" cost a reported $250 million. so with the "twilight" movies it's a real big bang for the buck. >> reporter: no empire would be successful without its loyal