The Heather Trott actress, who was written out of the Albert Square soap in March, will star in a comedy penned by Benidorm's Derren Litten.
Fergison told her followers on Twitter: "Fab derrin litten yes he of benidorm is writing a new series and i am lucky enough to be playing a character in it ..gonna be fab (sic).
"It is a new series called The Spa. derrin has already tweeted about it and i play a character in it ..rehursals tomorrow and costume fits.
"He is a genious and i love him and his work it makes me laugh out loud always and cant wait."
Sky Living's The Spa, produced by Tiger Aspect, will also feature Rebecca Front of Grandma's House fame and Auf Wiedersehen, Pet's Tim Healy, as well as Debbie Chazen and Nadine Marshall.
The 48-year-old appeared on Celebrity Come Dine with Me alongside Kerry Katona, Lionel Blair and Keith Harris on Sunday night (May 27).
She has also reportedly signed up for this year's second series of Celebrity Big Brother.
Litten's The Spa, which will contain eight episodes, is expected to be broadcast later this year.
