The flapper-style dress The Hills Whitney Port wore while frolicking the streets of Hollywood with her girlfriends looked very familiar when I first saw it. No wonder; it's Topshop's Heavy Beaded Dress ($79, originally $257). This is not just any old dress though. It's a knock-off of a Swarovski dress that sold for $10,000 for The Prince's Trust. If you're in the mood for the roaring '20s, this is the best and most affordable dress for you.