The singer – who made her television debut on the judging panel of Simon Cowell's music talent show this evening (Wednesday, September 12) – has been given limited access to liquor while the show is filming.
According to US Weekly, her representatives said in a note: "Very important. We require you to empty minibars of all alcohol.
"And no gifts of wine or any other alcoholic beverages, please."
Spears – who is also joined on the panel by Cowell, LA Reid and fellow newcomer Demi Lovato – is also believed to have banned pretty women from being backstage.
A source recently claimed that Spears requested that backstage staff working with her on the show should not be "too pretty or stylish".