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Now this is friendship. Kellie Pickler appeared in a video clip on Good Morning America Wednesday sporting a very different look: a totally shaved head.

The country starlet buzzed off her blonde locks on Tuesday in support of her best friend, Summer Holt Miller, 36, who was diagnosed with breast cancer in June and is starting chemotherapy treatments on Thursday.

“Cancer does not discriminate,” Pickler said in a release. Added Miller, “If this compels even one person to change their mentality toward waiting until the age of 40 for their mammogram, then it will be worth it.”

Miller — who has a family history of breast cancer — has always been vigilant about self-exams, and asked her doctor for a mammogram when she felt something might be wrong. After doctors did find a tumor, the mother of two underwent a double mastectomy, and was declared cancer-free in August (her chemotherapy treatments will help ensure the cancer doesn’t come back).

Pickler called Tuesday a “life-changing day,” and Miller made the reasons for shaving her head clear on her Caring Bridge website. “I was told that it was mentally much easier to do it this way than to wake up with my hair on my pillow,” she wrote. “I’m really not that apprehensive about shaving my head. It is hair and it will grow back.” Catch a behind-the-scenes clip of the women shaving their heads on Tuesday here. What do you think of Pickler’s move? And leave your well-wishes for Miller in the comments below!