The 21-year-old singer will be seen performing her new single Shine Ya Light on the show on Sunday, November 4.
Rita was a guest judge on the show earlier this year, appearing at the London auditions.
“I just want to discover someone that knows themselves; I want to discover someone that’s confident, because that’s what makes a star in my eyes,” Rita declared before auditions started at the O2 Arena.
Rita, who was a big fan of Rylan Clark at his first audition, claimed: “It’s not just about the voice; it’s definitely about you and what you create.”
Speaking about her experience on the judging panel, Rita described it as "surreal".
“It was surreal, but incredible. I’ve been watching it on TV for so long and now I’m sitting on the panel two singles deep – it’s definitely a statement.”
The R.I.P. singer explained: “I felt like it was my moment to help anyone who would take it. I wasn’t there to judge, I just wanted to enjoy people’s imaginations and creativity and try and direct it in the right way.”
The X Factor 2012 continues this Saturday night on ITV1, with the results show following on Sunday night with performances from Taylor Swift and Rebecca Ferguson.