Shortly after being read more instructions, jurors indicated they were deadlocked.
The judge ordered the panel to give him an update before lunchtime.
The eight women and four men are sifting through roughly a day's worth of testimony and arguments in the case, which was filed last year after the pop star hit a parked car and left the scene.
Spears hasn't appeared in court and didn't testify during the trial.
The jury deliberated for about two hours Friday.
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