The Office star Lucy Davis has revealed she's been diagnosed with terminal breast cancer, and she 'doesn't know how long she has left.' The actress, 53, shared her diagnosis in an Instagram post on Tuesday, and revealed the cancer has spread to her 'bones.' In her post, Lucy shared that she first discovered a 'tiny, hard spot' in her breast a year ago, and nearly ignored it before seeing a doctor. The Wonder Woman star said that despite the cancer being declared incurable she's 'at peace with whatever comes next.' Lucy shared her diagnosis alongside an emotional video that showed her ringing the cancer treatment bell, and she shared in her…