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, Lionel Richie and Luke Bryan talk 'American Idol' season 23 on 'The Tonight Show' in N.Y.C., plus Amanda Seyfried and more. From London to Paris and everywhere in between, see what your favorite stars are up to.

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.