The lawsuit also accuses the Recording Academy of negligence.
Portnow and the academy have denied the accusations.
She is described as an instrumentalist who is not from the United States and has performed at Carnegie Hall.
Neil Portnow.Credit: Michael Kovac/Getty
Representatives for the accuser and the Recording Academy did not immediately respond to EW’s request for comment.
Portnow allegedly raped the accuser that night, as she regained consciousness several times and found him assaulting her.
