Mass retailer Forever 21 has managed to do something that all lower end retailers dream of doing: knocking off designer looks and making a fortune. From caged booties to Balmain-inspired threads, Forever 21's fashion directors and designers are such geniuses. You can also add their marketing department to the list of in-house-genius. Doesn't their logo look quite familiar to you? Images from Forever 21 and GlobalLuxuryFashion.com.