Britney Spears "Extreme Demands" For X Factor TV Performace

Britney Spears has gone demand crazy if a tabloid report is anything to go by, as the singer prepares for her appearance on the UK's X Factor this weekend.

The pop star will be performing her Womanizer single tomorrow (November 29) and reports claim she has demanded security be tripled from the usual 15 guards to 45.

The insider has also claimed that Britney has barred the contestants from watching her performance at the side of the stage and also allegedly refused to sign any autographs or pose for photos with anyone related to the show.

"The studio has been in lockdown since yesterday in preparation for Britney's arrival," a source tells the Mirror.

"To say it is over the top is an understatement," the source continues. "That not even Simon Cowell or Cheryl Cole can ask for pictures with her is beyond belief."