The 45-year-old actress posted a moving photo of her and her mother, Rosa, on Instagram detailing "another day of #radiation" and followed up with her exciting afternoon plans Christmas shopping for her husband, Kurt Iswarienko.
"Today my mom came with me because even though I'm so tired after, I'm going Christmas shopping!!! Got to get @kurtiswarienko a present!! I love the holidays," she captioned the snap.
The former Beverly Hills, 90210 star has been battling breast cancer for more than a year and a half and recently revealed that she underwent a single mastectomy last spring.
"I had breast cancer that spread to the lymph nodes, and from one of my surgeries we discovered that some of the cancer cells might have actually gone out of the lymph nodes," she told ET. "So for that reason, we are doing chemo, and then after chemo, I'll do radiation."