Leigh Francis, the Bo' Selecta! comedian's real name, will star as his Celebrity Juice persona in the movie, which will be the first feature film comedy from Lionsgate UK.
Keith Lemon: The Film will see the ITV2 star follow his ambition to become an entrepreneur in the same vein as Virgin owner Richard Branson, becoming a billionaire before sensationally losing his fortune.
Ridley Scott's Prometheus's Mark Huffam has joined the project as producer alongside Simon Bosanque and Aidan Elliott
Executive producer Zygi Kamasa of Lionsgate UK said in a statement: "Keith Lemon is someone that everyone in the UK wants to be or wants to be with.
"Given his universal appeal and electric popularity with the ladies, making this film will prove to be an absolute rollercoaster of a ride for us, exposing Keith's natural talent - something he is very used to doing both on and off screen."
Meanwhile, Lemon commented: "It's a privilege to have the power of sight, hearing, touching and feeling. But to make a film which I am going to be able to see myself in, hear myself in, but unfortunately not touch or feel myself in because it's not in 3D is even more of a privilege.
"Especially since it's based on true life events that have happened in my true life, apart from of course 98.2 per cent of it which has been made up simply for entertainment purposes."
Bosanquet of Generator added: "We are looking forward to welcoming Keith to Belfast to shoot his debut feature film with our talented local crews and artists. He has a huge fan base in the province and will no doubt be the focus of much female attention."
> Keith Lemon to film new ITV1 show pilot
> Celebrity Juice videos: Little Ant & Dec, Katie Price's horse manure