I recently started a new job as an Assistant Manager in a department that employs 15 female food service workers. Recently, it was brought to my attention that one of the employees, who had breast augmentation and a tummy tuck, has been showing her cowork

I recently started a new job as an Assistant Manager in a department that employs 15 female food service workers. Recently, it was brought to my attention that one of the employees, who had breast augmentation and a tummy tuck, has been showing her coworkers her new breasts and tummy, and her scars. In showing her tummy tuck scars, she pulled down her pants, exposing her scars and everything else as she was not wearing underwear. Because this woman was getting so much attention, she began flashing her breasts at work on a regular basis to get a laugh. This happened before I started there. We work in a hospital and I was told that my boss was present and aware that this woman was exposing herself at work. Is this behavior against the law in California? Also, what am I obligate to do about it?