Demi Moore is the victim in a major credit card fraud case -- way over $100k worth -- according to federal prosecutors.
According to the criminal complaint, obtained by TMZ, 35-year-old David Matthew Read reported Demi's AmEx card lost or stolen in March, and when the new one was delivered through FedEx ... he somehow managed to pick it up.
The feds say he went on a spending spree, hitting a handful of Nordstrom and Saks Fifth Avenue stores in the L.A. area. Not exactly low-profile, kinda like his final tab. He allegedly ran up $169k over several weeks!
Read was spotted on surveillance cameras -- at the FedEx and also inside the retail stores -- according to the feds, who say he confessed to the caper when they nabbed him in April.
We're told Read's still sitting in L.A. County Jail. We've reached out to Demi's reps for comment ... so far, no word back.