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Country powerhouse Carrie Underwood stopped by "The Today Show" on Fri. (Sept. 26) to make a very special announcement.

After making some subtle hints (via social media) all week, the singer finally revealed what all her die-hard fans have been waiting to hear: new music.

“It’s a joyous, uplifting song about changing your life and having that ‘aha moment’ to waking up and your life being different from that moment forward,” Underwood said of her new single “Something In The Water” - co-written with industry taste-makers Chris DeStefano (Miranda Lambert's “Somethin’ Bad”) and Brett James (Brantley Gilbert‘s “Bottoms Up”) - which will sample a "Greatest Hits" collection set for a Dec. 9 release.

The song officially hits radio airwaves Monday (Sept. 29).

Of course, Underwood also chatted (briefly) about her upcoming performance at the Global Citizen Festival, to raise awareness for poverty across the globe. She will take the stage in Central Park on Saturday (Sept. 27) along with Jay Z, No Doubt, fun., The Rootsand Tiësto. Fans can get involved, even if they can’t attend the concert, right here.

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On being pregnant (one of the morning’s talking points), she said: “It’s still kind of weird, to be honest,” quickly adding that she’ll look at her hockey-playing husband Mike Fisher and say, “‘I’m gonna be a mom. You’re gonna be a dad.’ It’s like, is this real life? But we’re really excited.”

Here is the “Something In The Water” single cover art:

Moments after her appearance, Underwood revealed the stunning Greatest Hits: Decade #1 cover.