For the second time in less than a month, Britney Spears has been involuntarily committed to the hospital for a "mental evaluation hold" after police received a call from her psychiatrist.

"It was unclear exactly when they had received the call, but it was apparent that the operation had been carefully planned over a period of time," The Los Angeles Times reports. "Unlike the first welfare hold — in which Spears' ambulance was closely pursued by a throng of photographers — vehicles today were blocked from following the same route. The motorcade that whisked Spears to the hospital also showed a large investment in resources. The line of emergency vehicles stretched longer than a football field."

We'll keep you updated when we know more…