The So Macho hit maker is a regular on the ITV show and usually pops up every year in some form or another.
This year, Sinitta was apparently set to be a part of judges' houses with Simon Cowell but has been replaced by recent guest judge Mel B instead.
It's amid 'fix' claims over Sinitta's close links to contestants The Brooks, with the singer said to have managed the pair.
“It’s mental if I have been thrown off the show because of this [her connection to The Brooks]. There always has to be a scapegoat I guess," Sinitta complained to the Daily Star newspaper.
Simon himself is quoted as telling the tabloid: “I know she’s not happy [about being dropped at the last minute] but there’s always next year.”
However a spokesperson for the show denied that the decision was down to the 'fix' claims.
They said: "Mel B was the perfect choice for the Judges' House role."
Identical twins Josh and Kyle make up The Brooks who first appeared on The X Factor two years ago.
At the weekend the brothers spoke about their close ties to Sinitta and insisted she was nothing more than a "good friend".
“Sinitta is just someone we know from church at Hillsong. She’s become a good friend," Kyle told the Daily Star website.
Josh added: “Just because we are friends with Sinitta does not mean we are getting any extra treatment.”