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.

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

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

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

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 ...

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 ...

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

Carrie Underwood‘s cover of Heart’s “Alone” on American Idol is now one of the most memorable performances from her winning ...

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

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

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

Singer Carrie Underwood revealed she feared getting hate after a certain throwback moment on American Idol. Underwood, who ...