By Breaking Celebrity News Staff

He was once the dermatologist to the stars, and lived like one of them. Today Dr. Arnie Klein is bankrupt, under investigation by the state medical board, and is trying to pay off creditors by auctioning memorabilia from the very celebs who once made him famous.

Later this month, Bonhams & Butterfields will offer up hundreds of items from Klein's collection, including a  Princess Leia wig that Carrie Fisher wore to a party (estimated value: $200); the hat that covered Michael Jackson's head when he left a hospital burn unit ($10,000) and an invitation to Elizabeth Taylor's eighth wedding ($350).

Fisher, one of his few remaining friends, recently loaned Klein $150,000 to hire a new bankruptcy lawyer The Los Angeles Times is reporting.

Klein's medical practice was already in decline when Michael Jackson died, and amid rampant allegations that he'd pumped the singer full of drugs, his business went into free fall.

Defense lawyers for Dr. Conrad Murray insisted it was Klein who made Jackson dependent on drugs, specifically Demerol, and wanted to call him to the stand during the cardiologist's trial for manslaughter. The judge wouldn't allow it, and Murray was convicted.