The teenage singer from Northern Ireland is one of the last few hopefuls to perform for the panel, as Jessie, Sir Tom Jones, Will.i.am and Danny O'Donoghue fight to complete their line up of artists.
“I sing American Boy by Estelle and Kanye West,” Sophie reveals about her audition, “but I’m not allowed to say how the judges respond - you’ll have to watch Saturday’s show!”
But perhaps dropping a hint about how she got on, 17-year-old Sophie said she was overwhelmed by one judge in particular.
She admits: “Just to see [Jessie] was incredible. She’s an amazing role model.”
Speaking to the News Letter, Sophie continued: “This is definitely the most nerve-wracking thing I’ve ever done because you go out there and you’re waiting to see if the judges will like you or not - you aren’t getting any immediate feedback from the audience.
“It’s hard singing when you don’t know if people are liking it or hating it.
“But I love performing and this is a really exciting opportunity.”
See what happens in Sophie's audition tomorrow at 7PM on BBC One!