L.A. Rams Have Already Started 'Hard Knocks' Filming

Well, that was quick.

Just one day after it was announced the L.A. Rams would be the featured team on the HBO docu-series "Hard Knocks" ... cameras have already started to roll.

Check out the scene at the Rams facility in St. Louis ... it appears cameras are capturing Rams officials packing up the old offices and workout center -- even removing Super Bowl mementos from the walls.

Lights. Camera. Action.