Country music singer Carrie Underwood took home the Billboard Award for Top Christian Song. She won the honor during the 2015 Billboard Music Awards on Sunday night.

According to Sterling Whitaker of Taste of Country, the season 4 winner of "American Idol" has never been shy about publicly expressing her Christian faith. Billboard awarded her the honor for the song "Something in the Water," which talked about the importance of baptism and conversion.

"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," Underwood said.

Whitaker noted that "Something in the Water" has become Underwood's longest-running No. 1 song to date. He noted that it was "rare for a song with such an overt Christian theme to find its way to the mainstream."

"It's very humbling to be part of it," songwriter Chris DeStefano 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."

DeStefano added that Underwood's award-winning song had "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," DeStefano said.

Whitaker quoted some of the lyrics of Underwood's song. He noted that her song ended with a part of "Amazing Grace."

"There's somebody saying what I'm saying to you / Opened my eyes and told me truth / He said just a little faith and it'll all get better / So I followed that preacher man down to the river and now I'm changed / And now I'm stronger," Whitaker quoted in regards to Underwood's lyrics.

As for her personal life, Underwood's husband, Nashville Predators center Mike Fisher, posted a picture featuring himself alongside their baby boy, Isaiah Fisher, on Instragram on Friday.

"Me and my little man #lifeisgood," Fisher wrote alongside the picture.

Underwood then reposted the same picture on her Instagram account.

"They have my heart... #Repost," Underwood wrote.

According to Ree Hines of TODAY, it was the first time the couple shared the very first public photo of Isaiah. They previously posted a "sneak peek" picture of just one hand and his chin back in March.

Underwood spoke with TODAY about becoming a parent prior to the birth of her son.

"I have a wonderful mother, so if I can be even a little bit like that, I think we'll be good," Underwood said.