Summer Miller and Kellie Pickler Summer Miller and Kellie Pickler

Kellie Pickler debuted a brand-new buzzcut on Good Morning America Wednesday morning.

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The country cutie lost her locks the day before in support of her childhood friend, Summer Holt Miller, who was diagnosed with breast cancer in June. Miller, who also shaved her head, will begin chemotherapy on Thursday.

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"Cancer does not discriminate," Pickler explained in a statement on Facebook. "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 added.It doesn't seem as though Pickler misses her tresses too much. "Today was one of the most incredible days of my life," the singer wrote.