Names taking part reportedly include TV presenter and journalist Piers Morgan.
A source told The Sun: “Morgan and Clarkson squaring off on prime-time will be telly platinum. Piers relying on Jeremy for an answer with Ask The Host will be hilarious viewing...
"Piers has asked Susanna, a history buff, and Joan Collins, who has a wealth of general knowledge, to be Phone A Friends. But execs hope Donald might also get a call."
The pair have reportedly settled their 'feud' which began at the 2004 Press Awards.
Who Wants To Be A Millionaire? Celebrity Special will air this Christmas on ITV.