Sam, who the ITV talent show in 2013, has blasted head judge and her former label boss Simon Cowell, saying he favours runner-up Fleur East over Ben.
"I felt sorry for Ben on the X Factor tour," said Sam. "Fleur opened the show and had amazing outfits, pyrotechnics, dancers and big performances. Then Ben went on at the end and it was an anti-climax. It's obvious they are pushing Fleur to be the star."
Mum-of-three Sam, who was dropped by Simon Cowell's label Syco in February, added: "Simon can see where the money is going to come from and will make sure Fleur is the next big thing."
Simon mentored both Ben and Fleur on the show last year.
While Ben went on to win the show and land a record deal with Syco, Fleur also signed a recording contract with the music mogul's label a month later.
Both she and Ben are in the final stages of completing their debut albums, which are both expected to be released later this year.
Try Reveal's digital edition on iPhone & iPad. Subscribe now & never miss an issue!
X Factor's most shocking moments: