Ledger, the Oscar-nominated "Brokeback Mountain" actor who was the father of Williams' daughter Matilda, died in January of an accidental combination of prescription drugs. He was 28.
The New York Post quoted an unnamed source as saying Williams planned to boycott the upcoming premiere of "The Dark Knight," one of Ledger's last films, because Ledger's family is to be there and Williams is still "furious" with them because she "has seen nothing" from Ledger's will.
"The presumption that Michelle ever intended to attend 'The Dark Knight' premiere is unfounded, but to say she is 'boycotting' due to a rift with Heath's family is absurd," Williams' representative told Usmagazine.com. "It is time to allow this family to go about their lives without this continued scrutiny and speculation."