The former Atomic Kitten singer will star in an invite-only performance of Norma Jeane: The Musical in London this September. No official run has been made public as yet.
In a statement on the production's website, Katona said that she had always had acting ambitions: "A successful career in drama has always been a main goal of mine and this role is a challenge but one I'm going to grab with both hands."
She continued: "I'm thrilled to have been given this opportunity to play one of the world's biggest female icons and can't wait to get to work."
The singer has previously said that she finds acting "dead easy; you're somebody else and you leave your world behind."
The new musical, written and directed by Belevedere Pashun, includes original songs by a writing team that includes ex-Bucks Fizz bandmember Jay Ashton. The musical is described as "a new route into the personal history of Marilyn based on little-known facts from her life."
Pashun said: "Marilyn's life was one of extremes – poverty, abandonment, abuse followed by a flowering beauty which brought attention, fame, wealth and power, and then the well-documented tragic fall. I needed an actor of huge talent, personality and experience – Kerry was at the top of my list.
"This show will change the shape of people's perceptions of Marilyn Monroe, and we expect to announce a new star of drama on stage and screen with Kerry's performance."
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