Cindy Margolis Loses $1.4 Million in Robbery

The burglary took place the morning of May 22nd -- and sources tell TMZ, Cindy's mother was at home sleeping while it took place.

We're told the culprit made off with jewelry, TVs, a laptop, artwork, and her son's valuable sports memorabilia, including several jerseys signed by Michael Jordan, Kobe Bryant, and Shaq.

We're told a suspect has already been arrested in connection with the burglary -- but the investigation is still ongoing.