In a development that will doubtless outrage her many fans on the religious right, the nation's most popular country singer said, "As a married person myself, I don't know what it's like to be told I can't marry somebody I love and want to marry. I can't imagine how that must feel. I definitely think we should all have the right to love, and love publicly, the people that we want to love."
She said that her attitude towards same-sex marriage comes because of her Christian faith, rather than in spite of it. Though raised a Baptist, Underwood and her husband Mike Fisher, a professional ice-hockey player, now worship in a non-denominational congregation.
"Our church is gay friendly," she said. "Above all, God wanted us to love others. It's not about setting rules, or [saying] 'everyone has to be like me'. No. We're all different. That's what makes us special. We have to love each other and get on with each other. It's not up to me to judge anybody."
In the interview, she also condemned "people who use the Bible for hate", adding: "That's not how I would want myself as a Christian to be represented."
Read more: The Independent