Law enforcement sources tell us someone broke into Michael's San Fernando Valley pad a few weeks ago, and made off with an undisclosed amount of cash and jewelry. We're told the burglar got in after smashing a window.

We're told no one was home at the time and it appears to be a random hit. Sources tell us cops are waiting for Michael to give them a full list of the items taken.

The "Creed" star joins the ever growing list of celebs to fall victim -- Alanis Morissette, Emmy Rossum, Nikki Minaj and Jaime Pressly had their homes jacked in recent months ... and, Scott Disick was just hit early Sunday morning.