Harvey Weinstein forcibly performed oral sex on an aspiring production worker while she was on her period, the alleged victim has claimed in the latest allegation against the disgraced movie mogul.

Mimi Haleyi said on Tuesday that she was assaulted by Weinstein in what appeared to be a child's bedroom in his New York City apartment in 2006 when she was in her 20s.

She said she was aspiring to work in television and film production when she was first introduced to him at the London premiere of The Aviator around two years earlier and he helped her get experience on the set of a TV show being produced by The Weinstein Company.

But, she added, he repeatedly hassled her and even tried to force himself through her front door in an effort to get her to join him on a trip to Paris.

She said she thought she had put an end to his advances so she agreed to visit his New York loft apartment to keep a good relationship with the powerful producer but he quickly began making sexual advances and "backed" her into a bedroom covered in children's drawings.

"I told him 'no, no, no'. But he insisted," Ms Haleyi told a press conference in New York.