The 20-year-old singer wowed judges at her first audition with the self-penned 'Last Night', but her rendition of Maroon 5's 'Moves Likes Jagger' at Boot Camp - broadcast in tonight's (September 22) episode - was described as "awkward" and "messy".
After returning to the stage and impressing with a creative mash-up of hits from established artists, including David Guetta's 'Titanium', Pink's 'Raise Your Glass' and 'True Colours', Contostavlos decided to let the audience at Liverpool's Echo Arena hear a taster of Spraggan's own work.
"This isn't usually Lucy's kind of stuff," the 'Young' singer admitted. "I want you guys to hear what is so special about Lucy. I want to hear one of your tracks."
Spraggan then debuted a song entitled 'Tea and Toast' and burst into tears when she received a standing ovation from the audience and the judging panel.
Contostavlos described the Sheffield-based star as "absolutely amazing" and claimed she had been left "speechless" by the performance, while Gary Barlow declared: 'I wanna go buy your CD right now."
Spraggan's performance will be broadcast in tomorrow's (September 23) episode of The X Factor, which airs at 7.30pm on ITV1.