take a look. she's gone from bombshell blonde, radiant red, back to blonde, then brunette, then blonde again. many hairstylists warn against excessive coloring. >> the chemicals that are used, overfrequency with coloring your hair can result in breakage and hair loss. >> reporter: doctors say genetics and medical conditions may play major roles in female hair loss. but for celebs, who must present ever-changing looks, overprocessing can be troublesome. take the case of kelly osbourne, two has seemingly experienced every hair color under the sun. three years ago, she admitted to getting bald patches after a hair colorist forgot about her in the chair, telling the guardian newspaper i felt like i had been electrocuted and burst into tears. lady gaga, a natural brunette, has also discussed the difficulties of maintaining her