Nicole Richie has a heavy fringe which works well on any face shape, providing you get the angle right. If you have a round face you need to make the angle stronger to slim your face. If your face is squarer, you need to have a softer angle for the most flattering effect. It's also great on long faces to help break them up and give them a lift.
Ask your stylist for a bob with a sliding asymmetric fringe that's been sliced through to take the weight out of it.
To style this Nicole Richie hairstyle, spritz a light styling spray through your fringe when it's wet, through your fringe when it's wet, then wrap-dry it using a paddle brush. It will take a couple of weeks after you first have it cut to sit well.