Kellie Pickler and Amy Grant performed for guests that were literally partying pink on Tuesday night (Sept. 30) in Nashville. ‘Eat. Drink. Party Pink’ was a breast cancer awareness event meant to kick off Breast Cancer Awareness month with a bang and a few tears.

Several hundred guests fell quiet as Pickler talked about her friend Summer Miller's battle with cancer. When Miller (pictured above) was diagnosed, the country singer committed to shaving her head with her "sister," and the replay of that moment was as powerful as it was the first time, back in 2012. Miller stood to a round of applause when urged to do so by Pickler. The one-time 'Dancing With the Stars' winner then sang three songs, 'Don't You Know You're Beautiful,' 'Someone Somewhere Tonight' and 'Red High Heels.'

Amy Grant took the stage first, however, explaining that she was motivated to get involved with the fight to raise awareness for breast cancer after being invited to do so by Athena bottled water. The company was founded by a breast cancer survivor and continues to be a strong fundraiser for charities like the American Cancer Society. In fact, every tweet or retweet that uses #PartyPink (like this one) will trigger a $5 donation to the cause. It's a promise good up to $25,000.

Many guests were dressed in pink, while those who weren't hand a chance to sip a pink cocktail made special for the evening. The invitation-only event was held at the Rosewall in Nashville.

Earlier in the day, Grant debuted her new song 'Welcome Yourself' on the 'Today Show' and she played a stirring acoustic version on stage on this night. All proceeds from the digital download of the song will go to fight cancer. Find it at iTunes.

Both women spoke from firsthand experience about how breast cancer can wreck a family, but both spoke with great optimism about the chances of a cure and the importance of early detection. October is Breast Cancer Awareness month, and their support won't end here. Pickler is releasing a pink vinyl copy of her latest 'The Woman I Am' album, with proceeds going to Gilda's House, a community-centered home for those dealing with cancer.

As for her friend Summer? She's now cancer-free. 'Eat. Drink. Party Pink!' was also sponsored by Pandora Jewelry. Guests were able to try on the latest pieces from their line after the party.

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