At the pinnacle of his career, Sylvester Stallone reached an extremely private multimillion-dollar settlement with his half-sister Toni-Ann Filiti over allegations the movie star had abused her for years. 

Sources close to the “Rocky” star strongly believe the settlement was the result of a “shakedown” and that Stallone was a victim of blackmail!

According to documents obtained by Page Six, Stallone agreed nearly 26 years ago to give his half-sister $2 million in addition to $16,666.66 per month for her lifetime, and a trust with $50,000 per year for psychiatric and medical expenses.

According to those same documents, Filiti “asserted claims for personal injury, including physical injury” against Stallone, who “vigorously denied and continues to deny and dispute all claims of wrongdoing.”

Sources say she had threatened a lawsuit, but Stallone settled before it was ever filed. Filiti passed away this August last year from lung cancer at age 48.

Stallone’s mother says the settlement was the result of blackmail by Filiti, whom she described as a ‘pillpopping drug addict desperate for cash.’

“This was nothing more than a shakedown,” Jacqueline said yesterday. “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.”

She added of the allegations, “There were too many conflicting stories . . . At the time [in 1987] he was very hot, and his lawyers said, ‘Give her something just to shut her up.’ ”

Filiti’s 19-year-old son Edd, says, “They’ve made my mother out to be the black sheep,” and claims Filiti told him of the abuse allegations by “screaming about [them] over and over” while in a Florida hospital bed last year.

A Stallone 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.”

Ashton Tyler | Elite.