While her appearance hasn't been confirmed, the mum-of-three's ex Peter Andre has further fuelled those reports by stepping down from a reporting role linked to the reality show.
According to one British paper, the pop singer was scheduled to fly to Australia for three weeks to work as a behind-the-scenes reporter for This Morning.
But he has reportedly told TV bosses it would be "totally improper" for him to go ahead with that job if his former wife is taking part.
"Pete was really looking forward to going back to the jungle but as soon as he found out Katie was going to appear, he said there was no chance in hell he would go," a source said.
"Pete reckons there's no way he could speculate on Katie's antics and any outback flirtations in an unbiased way."
It was on the show in 2004 that the couple first met and fell in love. The Behind Closed Doors star is now expected to stay at home to look after the children and promote his new material.
News of Pete's decision emerged after the 11 confirmed contestants left the UK to head Down Under this week.
The 31-year-old glamour model – snapped in Los Angeles – is expected to join them in seven days as a new addition to the camp.
She will be the first contestant to return to the programme, earning a reported £350,000 fee.
Those definitely battling bugs on this year's show – beginning on Sunday - include EastEnders actress Lucy Benjamin, Dynasty's George Hamilton, former Strictly Come Dancing star Camilla Dallerup and snooker player Jimmy White.
Hollyoaks actor Stuart Manning and TV chef Gino D'Acampo will join Samantha Fox, interior design duo Colin McAllister and Justin Ryan, and How Clean is Your House's Kim Woodburn.