The 21-year-old joined Gary Barlow, Louis Walsh and Tulisa Contostavlos on the panel for auditions in London earlier this year, which will be broadcast tonight.
"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 declares before auditions start.
She reveals: "It’s not just about the voice; it’s definitely about you and what you create."
Louis meanwhile predicts that the guest judges will be big divas!
He laughs: "Every city we’ve got a guest Judge and they are always divas, I mean the biggest divas in town are on our show."
Along with Rita, Mel B and Nicole Scherzinger make appearances on the judging panel in tonight's latest show.
The X Factor airs tonight on ITV1 from 7:45PM.
Browse pictures of tonight's X Factor below...