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Arnold Klein is hinting that he may be the biological father of Michael Jackson's 15-year-old son Prince Michael.

The King of Pop's former dermatologist posted the above photos on Facebook ... showing a picture of Prince and a photo of Klein as a younger man. Along with the posting, he wrote "hmmmmm."

Klein, who until now has denied being Prince's father, has recently been suffering from financial issues after filing for bankruptcy.

Michael Jackson fathered Prince and sister Paris with ex-wife Debbie Rowe. She worked at one time as Klein's office assistant in Beverly Hills.