Celebrity hairstyle observation is always a good source for inspiration and keeping current with "WHAT IS HOT" is a good indicator for what your clients might soon be asking for, so you have the added advantage of knowing first hand what might become popular and maybe offer exclusive variations of the same cut.
Celebrity hairstylists always strive to be on the cutting edge of fashion which is what separates them from the average hairstylist. Although they have access to the latest "hot off the press" hair technologies you should learn to use your creative eye and recreate the vision for yourself. Such training will sharpen your haircutting skills and will take you beyond professional all the way to elite stylist.