Sam Fox, Stuart Manning and Jimmy White are taking part in another daredevil stunt - to raise funds to combat deadly malaria.
The former I'm A Celebrity... Get Me Out Of Here! contestants will skydive from 13,000ft (3,962m) for a project in Ghana, where malaria is responsible for one third of all deaths in children aged under five.
Sam said: "Malaria is a massive killer in Africa, especially for women and children, and it breaks my heart to think about such a huge loss."
She went on: "I've seen people affected by the disease and it's horrific. What's worse is that it's totally preventable and treatable."
Kim Woodburn, who also took part in the most recent series, will cheer the celebrities on as they take to the sky.
Gino D'Acampo, who was crowned king of the jungle during the show, described his former camp-mates' efforts as "fantastico".
The skydive will take place at Hinton Airfield in Northamptonshire on Thursday.
Charity Malaria No More UK said cash raised by the public during the latest series of the ITV show is to be invested in Ghana to help protect up to two million people from the killer disease.
Their combined efforts have helped fund an education project to ensure nearly one million mosquito bed nets distributed to 600,000 families in Ghana next month will be properly used.