Cheryl Cole calls Simon Cowell as key witness in 3.5 million-pounds compensation case over `X Factor` sacking

Washington: Cheryl Cole is all set to confront Simon Cowell in court as she steps up her 3.5 million-pound legal challenge to her US X Factor sacking.

The 30-year-old singer has turned down offers to settle with the show`s makers Blue Orbit and instructed lawyers to quiz how much Cowell along with judges LA Reid and Paula Abdul earn, the Mirror reported.

A Los Angeles judge gave her the green light to see the trio`s contracts.

An insider told the publication that this paperwork is a clear sign that Cole wants her day in court.

The source said that the singer is pushing for legal fees and a bonus, which could total 3.5million pounds.

The insider added that those papers could be the smoking gun if she can show others have been treated differently to her.