Usher and Tinie set for 'X Factor' mentor roles

Usher and Tinie Tempah are set to mentor on this year's 'X Factor'.

Kelly Rowland has reportedly snapped up her old pal Usher to be her sidekick at the Judges' Houses stage of the ITV1 talent show next month, when she will jet to a glitzy house in Miami to whittle down eight contestants to four finalists.