Gwen becomes a coach

Gwen Stefani is joining "American Idol" at leas t for one night. She is going to coach the contestants on their dancing and stage appearances. The show has decided to run the half hour results show for longer times so the contestants who get voted off will have their last chance to have their voices heard from the "Idol" stage. The new longer results show will start airing tomorrow night on FOX, but toon in tonight to see Gwen coach all of these hopefuls.