Sources tell ET that Alli Sims didn't quit her job working for Britney Spears.

Contrary to rumors circling the web, sources tell ET that BRITNEY SPEARS' assistant, ALLI SIMS, did not quit.

The rumors cited Sims being spotted transporting clothes as a possible indication that she had quit -- our sources say that she simply had clothes in her car to transport them into town.

Stay tuned for more details as they develop on Britney's custody hearing that is ongoing at this time.