OK! Exclusive: Carla, Who?

Don't expect to see Britney Spears' assistant Carla around anymore. Insiders tell OK! the singer fired her latest sidekick following her two weeks ago.

According to a source close to Britney, the singer "called Carla from Cedars and let her go," for reasons including "talking to the press despite a non-disclosure agreement, and lying to Kevin Federline's lawyers when she was interviewed prior to Monday's court hearing."