Mottram was rejected by Tulisa Contostavlos at Judges' Houses last year and lost out to Christopher Maloney in the public wildcard vote.
However, the Essex singer is back for a second attempt at pop fame and appeared at this year's auditions singing 'I Know Where I've Been' by Queen Latifah.
2011 contestant Terry Winstanley, who also made Judges' Houses, has also returned. He sang Michael Bolton's 'When I'm Back On My Feet Again' for Nicole Scherzinger, Gary Barlow, Sharon Osbourne and Louis Walsh.
It has also been reported on the Digital Spy forums that former contestant Melanie McCabe is back for a fourth attempt at reaching the Live Shows.
The X Factor series 10 starts on ITV later this year.
Digital Spy speaks to the X Factor judges and hosts: