X Factor judge Kelly Rowland said she would want to be performing on the show if she wasn't a judge. The 30-year-old star is on the panel along with Louis Walsh, Tulisa Contostavlos and Gary Barlow and the programme has had some big-name performers sing on the live shows, such as Lady Gaga, Katy Perry and JLS. Speaking to the Daily Mirror, she said: "If I wasn't on The X Factor, I would probably be wanting to get a performance spot on there. "I think the show plays a huge role in everybody's car…