Take Me Out host McGuinness sports a comedy moustache as he discusses Keith "selling his soul" in London and taking his mother to visit Madame Tussauds.
Watch the NSFW Keith Lemon: The Film clip below:
> 'Keith Lemon The Film' poster: Keith goes topless with Kelly Brook
> 'Keith Lemon The Film' releases new trailer
The comedy's supporting cast features a host of celebrity cameos, with Spice Girls Mel C and Emma Bunton, Fearne Cotton, Holly Willoughby, David Hasselhoff, Verne Troyer, Jedward, Ronan Keating and Gary Barlow all making an appearance.
Keith Lemon: The Film will open in UK cinemas on August 24.
Picture gallery - every celeb cameo in the Keith Lemon: The Film trailer:
