This is the most meaningful makeover of Kellie Pickler's life.

On Good Morning America September 5, the country music singer, 26, unveiled her newly shaved head, done in support of her best friend, Summer Holt Miller, 35, who was diagnosed with breast cancer in June.

Miller -- who has a family history of breast cancer -- will begin chemotherapy treatments September 6. "Cancer does not discriminate," Pickler said in a statement.

Miller, a mother-of-two, added that she hopes Pickler's actions inspire more women to be aware of their bodies. "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," she said.

The duo buzzed their heads in Nashville, Tennessee, September 4. "It's been a great life-changing day," Pickler tweeted. Miller explained why she felt compelled to shave her head 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."