New X Factor USA judge Britney Spears (30) has been dubbed ‘Bitchy Spears’ after turning nasty on the show’s wannabes.

The pop princess has been telling hopefuls “You’re predictable”, “You’re bad to the bone” and “You destroyed that song, sweetie”.

A source said: “She’s clearly been spending a lot of time with Simon Cowell. She’s Miss Nasty.” Britney has also staged several walk-outs during auditions — the latest being when a drag queen tribute act butchered one of Spears’ songs.