When Chris Brown was partying at the club last night, thieves were ransacking his new Los Angeles mansion.

Three armed men forced their way into Brown's San Fernando Valley residence at about 2 AM. Finding Brown's aunt there, they stuck her in a closet and then stole money and other property from the home.

By the time the aunt was able to get out of the closet and call 911 the robbers were long gone.

Brown was photographed entering the Hollywood club Argyle at 12:30 AM last night and then leaving at 2:15 AM.

It stands to reason that somebody at the club tipped off the thieves as to Breezy's whereabouts.

So far police have no suspects.

Update: Chris Brown's moms says it was an inside job.