fad hags
People who follow every new trend, fashion, and other pop culture phenomenon, untill something new comes along. 

These include the women who buy new designer clothes every "season" and get the latest haircuts, kids who want the very latest toy or gadget, and men who kiss butt on the golf course and show off their Plasma screens. 
 
People who can't think for themselves, but follow along with what everyone else says is "New! and Hip!" 

Rich people and Hollywood stars are Fad Hags; so are scene kids. 