X Factor hopeful Amelia Lily said her "rollercoaster of a journey" on the show has made her even more determined to win.
The singer, who was voted off in the first week only to be brought back to replace bad boy Frankie Cocozza, said being kicked off had helped her.
The teenager said: "I have had a rollercoaster of a journey. I went out in week one and came back five weeks later but you know what? If anything I think it kind of helped me. I came back stronger, I came back confident and I kind of figured out what kind of artist I wanted to be."
She added she was "really upset" about the slip-up which saw her mistakenly named as the winner by HMV this week, but insisted the show was not fixed.
Her mentor Kelly Rowland backed her, praising her "work ethic". The Destiny's Child star said: "In this music industry you have to work hard to get to a place where you want to be, but you have to work harder to stay there."
Meanwhile, judge Tulisa Contostavlos vowed to "change X Factor history" and make girl group Little Mix the first band to win.
The three final acts will be joined by stars including Coldplay, Leona Lewis and One Direction this weekend as the show comes to a climax.
They'll also perform duets with their mentors, with Tulisa promising to become a "member of Little Mix" on the night.
Gary Barlow promised an "emotional evening" when he joins Marcus Collins to perform Billy Joel's song Always a Woman.
He said the three finalists were the ones who "had grown the most" throughout the competition. He added: "I think they have all moved on incredibly well through the competition and that's why they are here now".