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X17 was on the scene XCLUSIVELY Friday night as Britney Spears found herself being pulled over by the Beverly Hills police! Brit was driving to the pharmacy after a long day of dance at Millennium, when out of nowhere, a motorcycle cop threw on his lights and motioned her over to the side!

Although we can't say for sure why Britney found herself talking to the cops, our photog seemed to think it had something to do with her driving without plates and her windows sporting some serious tint. And she appeared to have trouble finding her registration which would explain the worried look on her face. Nevertheless, the incident passed fairly quickly and the cop apparently elected to let Britney off with a warning.

Update -- Police say Britney was pulled over for allegedly speeding.

TEASER: We'll have lots more Britney stuff coming later, including Brit wearing a see-through dress AND Britney on a date!