The family of Casey Johnson yesterday denied a report that the ill-fated, baby-oil heiress has been buried on family property in New Jersey.

“She wasn’t buried today. She has not been buried,” a source with knowledge of the situation told The Post yesterday evening.

Asked when and where Johnson, the daughter of Jets owner Woody Johnson, might be finally laid to rest, the source only added, “It is a private family matter.

The person refused to say if Johnson, a diabetic whose body was found in her rented LA home Monday, was or will be cremated.

The comments came after celebrity Web site RadarOnline reported that Johnson, who was 30, had been buried yesterday at the family plot in New Brunswick, NJ.