Shannen Doherty has taken to Instagram to show her fans a challenging moment: The 45-year-old actress shaved her head amid her fight with breast cancer, reports US Weekly. Doherty reveals the process in a series of photos with her mother, Rosa Elizabeth Doherty, and a friend, Anne Marie Kortright. Here is the final one. The 90210 alum is suing her former management company over her cancer, alleging that it allowed her insurance to lapse, which in turn led to a later diagnosis. Doherty has previously said that she expects to have a mastectomy. (More Shannen Doherty stories.)