Britney Spears has reportedly demanded two Winnebago trailers to use when she appears on The X Factor this weekend.

The 26-year-old singer wants two trailers for her and her entourage to get ready in for her performance on the ITV1 reality show. But the studio carpark in Wembley, north west London only has room for one of the giant luxury caravans, according to The Sun.

But judge and show creator Simon Cowell has apparently come to the rescue by offering Britney his own personal green room – where he chills out before the show – to use as an extra dressing room.

A source said: “Most stars make do with one trailer – including diva Mariah Carey, Girls Aloud and Take That.

“Even Mariah got ready in the caravan, although Simon also gave her his green room. He’ll do the same for Britney.”

X Factor producers have also drafted in extra security for Britney’s appearance, where she’ll perform her new single Womanizer from her forthcoming album Circus on the show.

The remaining five finalists will sing her greatest hits in a bid to stay in the competition.