She and director Ridley Scott both publicly said that they would return for the reshoots "for free" in order to complete the nine-day reshoot session which would replace controversial star Kevin Spacey with Oscar victor Christopher Plummer.
Since the story broke that Wahlberg chose to use the #MeToo moment to profit from reshooting the film, The Wrap has reported that reshoots weren't in Wahlberg's contract while they were in Williams's.
A separate inside source said Wahlberg had his lawyer write a letter formally rejecting Plummer for the role unless his financial demands were met.
"What he said was, 'I will not approve Christopher Plummer unless you pay me.' And that's how he (expletive) them".
"I do want to say thank you to the producers for paying Niecy and I the same amount of money and Mark Wahlberg $1 million", Munn said.
Scott replaced Spacey with Christopher Plummer and re-shot the scenes just six weeks before the film's release.
When Ridley Scott said in an interview with in December that he and his cast - excluding Plummer who was paid - were working for free to reshoot the movie in the wake of the Spacey debacle, he was unaware of Wahlberg's side deal, and was reportedly left feeling betrayed and 'hung out to dry'.
Both Scott and Williams have spoken about doing the reshoot for free, with Williams telling USA Today last month that she would even give up her Thanksgiving holiday for the reshoots.
Williams and Wahlberg are both represented by Williams Morris Endeavor, and some critics have accused the talent agency of failing to inform the Oscar-nominated actress of her co-start's lucrative arrangement.
However the reported Wahlberg's reshoot fee in November and noted he, "along with manager Stephen Levinson and agency WME, have a reputation in Hollywood for driving a tough bargain".
'Everyone did it for nothing, ' he told USA Today. "Because I appreciated so much that they were making this massive effort".