Scarlett Lee's X Factor audition split the judges earlier this year.
The 19-year-old make-up artist's singing was branded "annoying" after first performing for the panel, but she still made bootcamp.
Scarlett from Surrey told cameras: "Growing up I was always the biggest X Factor fan to actually be here is the most incredible thing in the world.
"I love being a make up artist but I love singing more. Literally from the minute I could walk and talk, I was writing songs.
Scarlett came accompanied by a huge crowd of supporters, saying: "If you're going to do X Factor you've got to do it big style. We've got the T shirts, we've got the banners. I've got the best support, the best family backing me up. I can't wait to do these people proud."
In the audition room, Scarlett told the judges: "I believe I have The X Factor. It's me!"
Scarlett began her audition with a medley of songs but Simon Cowell quickly stopped her and said it was "too annoying".
Instead, he invited her to sing Andra Day's Rise Up.
After, Simon said: "You've made this very difficult for yourself and for us. You're trying to be too clever for your vocals, your song choices are all over the place."
"I just don't think your ready for us," Sharon Osbourne added, "Your voice is all over the place."
But Louis Walsh encouraged: "The raw talent is there in front of us, I know it."
Scarlett ended up with three yeses with Simon taking a leap of faith and saying yes after Sharon gave a no.
"This is your lucky day," Simon told the teenager.
More hopefuls on Scarlett's audition show included 51-year-old Peter Warick from Northampton who arrived in the audition room with a cake and duo Afro-Swag who presented Simon Cowell with a special gift from Africa.
Plus we met Montenegro's former Eurovision entry Slavko and runner up of The Voice of the Philippines' Alisah Bonaobra, who has flown in from Manila, Philippines.
The X Factor 2017 airs Saturday and Sunday night on ITV.