The shape of your face will dictate your hairstyle to a very large extent. For instance those with heart shaped faces will always look good with chin length hair or any type of long hairstyle for that matter. In fact most of the celebrity hairstyles look good since a lot of thought has gone behind them. The personal stylists of celebrities often try out different styles based on the facial features of these celebrities before arriving at a particular hairstyle. Whether it is Jennifer Lopez or Brad Pitt, or for that matter any celebrity, they look good in their respective hairstyles because the particular style suits their face.
The trend these days is towards more loosened hairstyles. Many celebrity hairstyles are based on this trend nowadays. With the right cut, almost anyone can look as beautiful as a celebrity. The best way to go about it would be to have a particular celebrity whose face closely resembles your face's shape, as a role model. This way you can try out the hairstyles of that particular celebrity. Another alternate way would be to visit any of the virtual hairstyle websites over the internet. You can upload your photo at these websites and try out different hairstyles on your photo. This would give you a good idea about which particular hairstyle suits you or not.