Carrie Underwood gave fans a blast from the past by performing "Alone" on "American Idol," two decades after doing so on the ...

“American Idol” judge Carrie Underwood has surprised viewers with a callback to her time on the show in 2005.

Carrie Underwood, 42, went back to her “American Idol” roots for the season’s “iconic Idol moments” special on Monday night.

There were enough hints dropped by American Idol regarding this nostalgic performance, but still, it took fans by surprise.

After an incredible compliment (and true prediction!) from 'American Idol' judge Simon Cowell, Underwood says she felt like ...

Carrie Underwood reunited with other former 'Idol' contestants from the show's fourth season in 2005. Here's what they said ...

Longtime American Idol viewers undoubtedly recognized the dress Carrie Underwood wore on the show on Monday night (April 28).

Carrie Underwood is giving "American Idol" fans a ... Idol" by delivering a show-stopping performance of the song "Alone," made famous by Heart, just as she did on the show 20 years earlier.