The extra says the incident happened in a dark hallway in 2009.
She hinted at a troubling experience with Piven when she was "far too young."
Piven says he "unequivocally" denies the allegations.
Over the years, sitcoms and award shows have poked fun at and alluded to Harvey Weinstein’s alleged sexual harassment.
It was previously reported that the actress had been asked to take her top off at an audition.
Well, I have taken many "breaks" to deal with it. Not necessarily because of anything physical, but more emotional. There are times when this disease has really made me question my self worth, my purpose, my talent.. because now I had limitations I never had to deal with before, and it really would take its toll.