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After today's brief deposition, Kevin Federline's lawyer entered Britney's house shortly before 8pm, followed by 4 LAPD cop cars!

Us reports that police were called in when Britney refused to turn the kid's over to Kevin's bodyguards.

Not long after their arrival, photogs spotted Brit's friend Sam entering her Beverly Hills compound.

In addition to the cop cars, 3 LAPD police helicopters arrived around 10 pm, and are circling overhead, searching the grounds with spotlights. The Fire Department is on the scene as well!

WTF is going on here?!?

Stay tuned...