TV
Rex Features
The American singer, 26, apparently wants two large luxury motorhomes for her entourage. Take That, Mariah Carey and Girls Aloud only used one trailer when they appeared on the show.
Simon Cowell is allegedly offering his personal green room to Spears to give her more space.
A source told The Sun: "Even Mariah got ready in the caravan, although Simon also gave her his green room. He'll do the same for Britney."
Spears will perform her new single 'Womanizer' on Saturday's live show. Her album Circus is released on December 1.
> Click here to read our review of 'Womanizer'
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