Doris Long, 95, from Hayling Island, Hants, will take part in her latest adrenalin rush in May by throwing herself from the top of the civic office building in Portsmouth.
New BBC Radio 2 breakfast show presenter Evans will accompany Mrs Long after hearing of her recording breaking feats on his programme.
And after being introduced to Gavin and Stacey star Corden at the Pride of Britain awards where he presented her with a prize for her fund-raising efforts Corden is also set to take on the death-defying drop.
Mrs Long said: "It is very exciting. I like Chris very much; he is a very funny man.
"I met James Corden recently and he was lovely too. I have met so many famous people through my fund-raising and it is still great fun.
"If either of them are scared I will be on hand to give them some tips on getting down safely."
