Britney Spears is an "incredibly tough" judge on The X Factor.
The "Toxic" singer is part of the new line up on the US version of the singing talent show, and doesn't give budding singers an easy time if their renditions aren't up to scratch.
"She's got a really good instinct, and when she loves something, she looks like she wants to dance on the desk. When she doesn't like someone, she is incredibly tough," a source said.
Britney's harder side was revealed at the show's auditions in Kansas at the weekend, where she starred on the panel alongside Demi Lovato, L.A. Reid and Louis Walsh, who had stepped in from the UK version of the show to replace Simon Cowell, who was taken ill with bronchitis.
"You have to be great to be on this show, so I vote no," Britney told one contestant, according to the source.
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