Carrie Underwood may have won American Idol years ago, but stepping into the judge's seat has come with a learning curve. Luckily for the new judge, her fellow co-stars, Luke Bryan and Lionel Richie,

Carrie Underwood's choice to perform at the inauguration might make for a tense 'American Idol' season with fellow judge Lionel Richie. Here's what a source shared.

American Idol judges Luke Bryan, Lionel Richie, and Carrie Underwood faced off in a heated edition of the Name That Song Challenge on the March 5 episode of The Tonight Show. Bryan and Richie competed against Underwood and Jimmy Fallon,