Jennifer Hudson to be guest X Factor judge

Jennifer Hudson is going to be joining Kelly Rowland as a guest judge for 'The X Factor' Judges Houses' stage.

Jennifer Hudson is going to be Kelly Rowland's guest 'X Factor' judge.

The actress-and-singer is to replace Usher, who has had to pull out at short notice, and join the former Destiny's Child star in Miami for the Judges' Houses stage.

A source told The Sun newspaper: "Kelly is thrilled Jennifer is joining her."

Jennifer will help Kelly - who is mentoring the girls - pick her final three acts to make it to the lives shows.

The Hollywood star should be able to give the pop hopefuls invaluable advice because she was previously a contestant on 'American Idol' and although she was axed by the panel she went on to win an Oscar for her performance in the movie 'Dream Girls' and has a series of hits.

The other guest judges will be Jessie J, who will be assisting Tulisa Contostavlos in picking the groups, Robbie Williams, who is helping Gary Barlow look after the boys, and 80s pop star Sinitta, who will be assisting Louis Walsh as he selects the over-25s.