SYLVESTER STALLONE blackmailed, say reports, by his late half sister who claimed abuse.

Sly’s half-sister Toni-Ann Filiti alleged he abused her for years, resulting in a multimillion-dollar payoff/settlement that the Rocky star claims he was blackmailed into.

In paperwork obtained by The New York Post’s Page Six, the agreement was signed 26 years ago and shows Sly agreeing to pay Toni-Ann $2 million plus $16,666.66 every month as long as she lived, as well as a trust of $50,000 per year for medical and psychiatric expenses.

Despite Toni-Ann’s abuse claims, sources tell the New York paper that the settlement was part of a “shakedown” and that the 66-year-old action thesp was blackmailed noted.

The NY tab says the settlement paperwork said Toni-Ann “asserted claims for personal injury, including physical injury” against her half-brother, while he “vigorously denied and continues to deny and dispute all claims of wrongdoing.”

Toni-Ann lost her battle to lung cancer and passed away on August 26 at the age of 48.

“This was nothing more than a shakedown,” Sly’s mom, Jackie Stallone, told the Post.

“Toni-Ann was on 65 Oxycontin pills a day, and she threatened Sylvester. A drug addict will do anything. When Sylvester became famous, she didn’t have to hook. He was trying to help her. He caved in.”

Jackie continued, “There were too many conflicting stories… At the time (1987) he was very hot, and his lawyers said, ‘Give her something just to shut her up.’”

Sly’s rep said, “Unfortunately, celebrities, politicians and athletes frequently find themselves the targets of blackmail efforts by family members and associates who fabricate claims in order to extort payments from them.”