Steven Tyler Has Signed on to American Idol: Sources

American Idol hopefuls: You may want to start brushing up on "Sweet Emotion." Steven Tyler signed a deal to become the next American Idol judge last week, according to show insiders, becoming one of two replacement judges to fill seats vacated by Simon Cowell and Ellen DeGeneres at the end of the ninth season. The Aerosmith frontman is currently touring, and it's unclear how his new obligation will impact his touring. Read the full article. (More Steven Tyler stories.)