The show was filmed under coronavirus-safe conditions last autumn and will be the last celebrity series to feature head trainer Ant Middleton, who was dropped by Channel 4 last month for "conduct"-related reasons.
According to The Sun, 40-year-old Katona decided to sign up for the notoriously-tough show after getting fit during coronavirus lockdown.
"Aside from I'm A Celebrity in 2004, Kerry has never taken on a show more challenging than Celebrity SAS: Who Dares Wins," a friend told the newspaper.
"After spending a lot of last year getting her fitness up she decided to take the plunge when approached by Channel 4.
"Kerry is a tough cookie, mentally and physically, so viewers may be surprised by how well she gets on.
"There is a lot more to Kerry than meets the eye and she really threw herself into the competition."