Singer beats out Steven Spielberg, Simon Cowell for top spot
'X-Factor' judge joins new addition Adam Lambert for show's fifth season
Singing competition is undergoing major changes
The pair will replace Britney Spears and L.A. Reid
Singer performs single from her upcoming fourth album, 'Demi'
Singer will rejoin Simon Cowell as a judge for Season Three
'I wanted to make a record with an open mind,' says runner-up
'Holler If You're With Me' to premiere during Grammys
Pop star says, 'It's time for me to get back in the studio'
Singer's rep says project is still in the planning stages
Pop star judge to be fired after just one season on talent competition
Looks to Garth Brooks, George Strait as career models
One Direction, Pitbull perform in drama-free wrap-up
'This is the best day of my life,' country singer says
Contestants pay tribute to Connecticut shooting victims