The soap star had been set to enter the jungle this weekend but has instead been axed, in favour of little known Irish model Nadia Forde.
Gemma's stint on the ITV series had been timed to follow her exit from the Channel 4 show this week.
But a last minute decision by bosses means Gemma won't be appearing, The Sun newspaper reports.
An insider told the tabloid: “Gemma is pretty upset.
“She thought leaving Hollyoaks and going straight into the jungle would be the perfect move for her but it hasn’t worked out.”
Show chiefs have been preparing the line up with plenty of female eye candy, with Playboy bunny Kendra Wilkinson another model set to take part in the series alongside Nadia.
The 29-year-old made headlines for dating Playboys Hugh Hefner ten years ago, when he was 78.
She said as she arrived in Australia last night: "I'm not a girl into home comforts and luxury. I like getting dirty."
Other celebs who have arrived for the show include Corrie actor Craig Charles, Irish model Nadia Forde, actress Carl Fogarty and Allo' Allo' star Vicki Michelle.
I'm A Celebrity Get Me Out Of Here 2014 starts November 16 on ITV.
Browse pictures of the rumoured I'm A Celebrity 2014 contestants here...