If you watched James Corden's recent Carpool Karaoke with Britney Spears, you probably thought that seeing him dressed as Britney circa her 'Baby One More Time' schoolgirl style was all you needed to haunt your dreams for the forseeable future.

That's only because you haven't seen the new TV ad for Apple Music yet, which sees Corden pitch an idea for an ad to a panel that includes Jimmy Iovine.

His winning pitch sees him dress as 'every iconic music star in history', including David Bowie, Slash, The Spice Girls and Pharrell.

Needless to say, The Spice Girls one is more than a little disturbing, as the picture above illustrates.

Watch it below: