They'll be filmed 24 hours a day as they live in their "academy" - the Big Brother bit.
And each week viewers will get to vote off the person they think is least good - the Pop Idol bit.
The wannabes will be trained by top people in the music biz - and the BBC says they could be real stars, like Robbie or Dido.
Auditions for the wannabes will be held soon.
If you think you have the voice of Anastacia or can out-sell Stereophonics, send a short VHS tape of you performing a well-known song to: PO Box 32702, London, W14 OWB by 5 August.