Once again, Christian country singer Carrie Underwood's song "Something in the Water" earned her another distinction since she took home the Top Christian Song honours at the 2015 Billboard Music Awards on Sunday night.

The song deals with the power of baptism and conversion, and Underwood said that it captures the moment when people realise how their life can change because of God.

"It's really kind of a joyous, uplifting song about changing your life for the better and kind of having that 'a-ha' moment, to waking up and your life being different from that moment forward," she shared.

Meanwhile, "Something in the Water" songwriter Chris DeStefano told Taste of Country that they already knew the song was special right from the start. It is rare for Christian music to make it big mainstream, but "Something in the Water" managed to do so despite having a strong Christian theme, and it remains Underwood's longest-running number one song to date.

"It's very humbling to be part of it," he said. "One of the things that's been really exciting for me — I know it sounds crazy — is just reading tweets, and seeing how it's affecting people directly. You're able to really see people's emotions as they're writing on Twitter. It's incredible that it's having such a powerful effect on people. As a songwriter, that is all you can hope for, is to affect people and touch people, and make a difference in their lives, in small ways and big ways."

At the same time, Underwood is pretty excited about leading the nominations for this year's CMT Awards, and even shared a selfie she took with her nomination on her Instagram account (@carrieunderwood). The country singer wrote, "Look what came in the mail today! So excited!"

She also congratulated fellow nominees on another post: "Congratulations to @CMT Music Awards Breakthrough Artists of the Year Nominees@ChaseRiceMusic @FrankieBallard@KelseaBallerini @MaddieandTae@RaeLynnOfficial @SamHuntMusic What a year you've all had! Excited for the show on June 10!"