The 23-year-old appeared in the ninth series of the Channel 4 reality series back in 2008, but was one the first booted out.
The Liverpool singer had previously released music on her own, before auditioning on The X Factor in 2010 as part of a girl group.
This weekend's show sees Stephanie take to the stage with her pal Sophie Houghton as part of singing duo [tag]Poisonous Twin[/tag].
The pair are seen impressing the judges on this Saturday night's episode of Xtra Factor, which airs on ITV2 at 9:10PM after the main show on ITV1.
Browse pictures of this weekend's Xtra Factor acts below, including Poisonous Twin...