According to The Sun, Fox will be paid £60,000 for her appearance on the show after her manager and partner Myra Stratton agreed a deal with ITV.
An insider said: "Sam is a Page 3 icon and will be the show's glamour girl.
"She's no pushover and will speak her mind. She'll be a strong contestant and viewers will be interested to see what she's up to."
The newspaper also claims that Jimmy White has been hired for the show but adds that Jack Osbourne has turned down an offer of £100,000 to appear.
I'm A Celebrity returns for its ninth series on Sunday, November 15 on ITV1.