But so far we've seen little of her, despite much publicised comebacks from other acts.
Housekeeper Relley Clark from Birmingham got four yeses back in 2013 after singing for the judges - including current members Nicole Scherzinger, Sharon Osbourne and Louis Walsh - in the room auditions.
She then performed at the arena auditions but struggled.
"I remember your last audition and it was absolutely amazing, we totally loved you," Louis told her. "What happened today? It wasn't great."
Sharon agreed: "It was a weird song choice for you, I think you're capable of much better."
However Relley C fought back went on to make it to judges' houses with Nicole in Antigua following the six chair challenge.
At the time, Relley said she didn't want to go through the process again.
"I would not wish that experience on my worst enemy. It was awful. I never want to sit on a seat again!" she said. "It’s a very dramatic experience, it’s something none of us are going to forget."
But this year Relley has come back and Sunday night we spotted her at bootcamp, where she made it through to the six chair challenge again.
Could Relley get through to judges' houses again?
Now in the Overs category, it'll be Sharon Osbourne who this time decides Relley's fate.
Watch her (very) brief appearance from judges' houses below...
The X Factor's xix chair challenge airs this Saturday and Sunday night on ITV.