Carrie Underwood is a "10" in more ways than one. She's sold more than 10 million albums with her first two records alone, and now Carrie has hit another milestone 10 as her current smash, "I Told You So," becomes her 10th single to top a key sales or aiplay chart. The accomplishment makes the four-time Grammy winner the first country artist in history to achieve 10 #1 singles on the strength of their first two albums.

This also marks the fifth consecutive chart-topper from Carrie's "Carnival Ride" album, which includes "Just a Dream" and three hits Carrie co-wrote: "So Small," "All-American Girl," and "Last Name." In addition to her original recording of "I Told You So" on "Carnival Ride," fans can also enjoy a special studio duet of the song, currently available as a digital single, featuring Carrie with Randy Travis.

The newly crowned ACM Entertainer of the Year and three-time reigning ACM and CMA Female Vocalist accomplishes the rare feat of taking a former #1 song to the top of the country charts a second time, 21 years after Randy Travis first saw his composition hit the chart summit. She is the first country artist to return a song to #1 in nearly 9 years.

The only American Idol winner ever to achieve 10 #1 hits, Underwood's collection of chart-toppers began with the instant success of her post-American Idol single, "Inside Your Heaven," which debuted atop Billboards Hot 100 chart in the summer of 2005. It was the first of five #1s to top the charts from her 7x-Platinum debut, "Some Hearts," with the others including the Grammy-winning "Jesus, Take the Wheel" and "Before He Cheats," as well as "Don't Forget to Remember Me" and "Wasted."

And in a bit of Carrie trivia, 10 continues to be a lucky number for the season 4 winner. Her birthday is March 10, and just two weeks after her American Idol win in 2005, she made her debut on the Grand Ole Opry on the 10th of June and later became a member of the Opry with her official induction on May 10, 2008.

See photos from Carrie Underwood's performance of "I Told You So" with Randy Travis on this season's Grand Ole Opry week here.