Last night on the Teen Choice Awards red carpet, Kellan Lutz (Emmett Cullen) joked that it's "Rob's hair" that's the secret to the movie series' overwhelming success with teenagers.
But is it a joke? We can't think of a more famous head of hair since Rapunzel, star of the German fairy tale.
Last year RPattz spilled the secret to the shiny, disheveled 'do with high-hold: wash it once every six weeks.