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The TV presenter is trying to win the Guinness World Record title for 'Most Coins Flipped Simultaneously' in promotion of his new show 'Heads Or Tails' on Five.
Justin said: "I can't wait to go flipping crazy and hopefully, we will manage to set a new Guinness World Record - bring it on!"
He added that the actual number of coins which need to be flipped is an ambiguity, and depends on the number of people who come to the event.
He added: "It's based on numbers, so if we can get a thousand people there, all flipping coins at the same time, I think that will be a world record.
"I'm not sure if there's an existing record we have to beat - this could be a first."
The first 100 people to attend the attempt at London's Covent Garden, from 10am tomorrow will receive a commemorative T-shirt.
The show 'Heads or Tails' will give members of the public the chance to become a millionaire simply by guessing the outcome of tossing a coin correctly a number of times.
They will have friends, family and celebrity guests who they can call on to help make simple but agonising choices, on their quest to win £1million.
The show airs nightly for a series of 11 programmes from Dec 20 on Five.