The Screen Actors Guild-American Federation of Television and Radio Artists is investigating claims Michelle Williams was paid significantly less than a male co-star.

The labor union is looking into reports the 37-year-old actress earned less than 1 percent of Mark Wahlberg's pay for reshoots on the Ridley Scott-directed film "All the Money in the World," according to Deadline.

"We're looking into it," a union source said. A SAG-AFTRA representative later issued an official statement on the matter.

"We are unambiguously in favor of pay equity between men and women in this industry and support every action to move in this direction," the rep said.

"At the same time, performs at this level negotiate their above-scale rates through their agents. As it relates to this matter, you should talk to their representatives."

Williams and Wahlberg re-shot scenes for "All the Money in the World" after Kevin Spacey was axed from the movie following allegations of sexual misconduct.

The pair filmed with Spacey's replacement, Christopher Plummer, Thanksgiving week.

USA Today reported Tuesday that Williams was paid less than $1,000 for the re-shoot, while Wahlberg made $1.5 million.

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Williams and Wahlberg are both represented by William Morris Endeavor talent agency.

Williams previously told USA Today she was happy to accommodate the re-shoot, saying, "They could have my salary, they could have my holiday, whatever they wanted. Because I appreciated so much that they were making this massive effort."