Carrie Underwood gave fans a blast from the past by performing "Alone" on "American Idol," two decades after doing so on the show in 2005.

The season 4 winner is now a judge on 'American Idol,' and she joined in the show's "Iconic Idol Moments" night by re-wearing ...

“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.

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).

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

Days after she shared a 20-year-old clip of her performing Heart’s hit 'Alone,' she opened the show’s Rock and Roll Hall of ...

It’s been 20 years since Carrie Underwood won Season 4 of American Idol in 2005, but she can still fit into the same exact ...

Carrie Underwood's choice of dress for the American Idol finale is turning heads. The judge wowed audiences when she slipped ...

The theme of tonight's episode of American Idol is "Rock and Roll Hall of Fame Night," and judge Carrie Underwood is ready to ...

Carrie Underwood has come full circle since winning "American Idol" two decades ago. The singer has sold over 85 million ...