Carrie Underwood will release her first hits compilation, Greatest Hits: Decade #1, on Dec. 9. She made the announcement Friday (Sept. 26) during an appearance on NBC's Today.

A final track listing hasn't been revealed, but the project will also include new material, including "Something in the Water." Set for release to retail on Monday, Underwood co-wrote the new single with Chris DeStefano and Brett James.

"'Something in the Water' is so inspirational," Underwood said. "It's joyous. I can't help but smile when I hear it. I hope it has the same effect on everyone who listens to it."

Underwood said the greatest hits album gives her the opportunity to share new songs while preparing for her next full studio album.

"I can't believe it's been a decade since I auditioned for American Idol," she said. "Looking back at the songs I've released over the years lets me relive my amazing journey. Even better, I get to include new music for the fans."

Underwood performs Saturday in New York's Central Park during the third annual Global Citizen Festival, a free event that's part of a campaign to achieve a world without extreme poverty by 2030. The concert will also feature Jay Z, No Doubt, Sting, fun., the Roots and Tiesto.

Underwood's latest Top 10 country single, "Somethin' Bad," is a duet with Miranda Lambert.