Our photographers report that there was "police activity" at Britney's home this morning at 4 a.m.

Apparently there were two police cruisers, both with lights on and no siren. One left and the one that remained, stayed for approximately 30 minutes.

UPDATE: We just got off the phone with the LAPD who said the police cruisers who showed up at Brit's as a response to a call from the residents of Brit's Beverly Hills community, not Britney, herself. But we're still digging, so stay tuned!