This is getting insane! Cops and ambulance arrived at Spears' home, a stretcher was taken in and PageSix.com is reporting that "someone is being transfered to the hospital for a mental evaluation."

Apparently Britney was "hysterical and just wants to keep the kids overnight."

The ambulance is leaving Spears' home RIGHT NOW!

UPDATE:
Sam Lufti was just seen leaving Spears' home with an officer.