Sarah Michelle Gellar is showing her support for Shannen Doherty.
The actress took to Instagram to share a touching tribute to the "Beverly Hills, 90210" alum, who is battling breast cancer.
"My #mondaymuse (and really every day #muse) is my brave friend @theshando," Gellar wrote. "I've always said she is one of the most loyal friends I've ever known, and now while she is facing the toughest journey of her life, she is sharing it with friends she has never met in the hopes of helping other people who are going through the same struggle. That's a true friend."
She ended the post with the hashtag: "#F--- Cancer."
Doherty recently revealed that she had been battling the disease since March 2015.
"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 Entertainment Tonight. "So for that reason, we are doing chemo, and then after chemo, I'll do radiation."
"The unknown is always the scariest part," Shannon admitted. "Is the chemo going to work? Is the radiation going to work? You know, am I going to have to go through this again, or am I going to get secondary cancer?"
She continued, "Everything else is manageable. Pain is manageable, you know living without a breast is manageable, it's the worry of your future and how your future is going to affect the people that you love."