'Today isn't about me': Michelle Williams praises Mark Wahlberg after Time's Up donation

US actress Michelle Williams has lauded her co-star Mark Wahlberg after his generous donation.

Mark Wahlberg (L) and Michelle Williams attend the premiere of Sony Pictures Entertainment's 'All The Money In The World' at Samuel Goldwyn Theater. Source: Getty Images

Mark Wahlberg's $2.1 million donation to women's rights group Time's Up has prompted high praise from co-star Michelle Williams.

Following an outcry over a significant disparity in pay between co-stars, Wahlberg agreed to donate the $2.1 million (or US$1.5 million) he earned for reshoots for All the Money in the World to the sexual misconduct defence initiative, Time's Up.

Williams released a statement, thanking her co-star and the "community of women and men who share in this accomplishment".

"Today isn't about me. My fellow actresses stood by me and stood up for me, my activist friends taught me to use my voice, and the most powerful men in charge, they listened and they acted," Williams' statement on Saturday read.

"If we truly envision an equal world, it takes equal effort and sacrifice.

"Today is one of the most indelible days of my life because of Mark Wahlberg, WME and a community of women and men who share in this accomplishment.

"Anthony Rapp, for all the shoulders you stood on, now we stand on yours."

Wahlberg said he would donate the money in the name of Williams, who reportedly made less than $1400 on the reshoots.

"I 100% support the fight for fair pay," Mr Wahlberg said in a statement.

The announcement came after directors and stars, including Jessica Chastain and Judd Apatow, shared their shock at reports of the huge pay disparity for the Ridley Scott film.

The 10 days of reshoots were necessary after Kevin Spacey was replaced by Christopher Plummer when accusations of sexual misconduct surfaced against the former House of Cards star.

USA Today reported Williams was paid less than $1400 for the 10 days.

Both Williams and Plummer were nominated for Golden Globes for their performances.

Talent agency William Morris Endeavor, which represents both Williams and Wahlberg, said it would donate an additional $700,000 to Time's Up.

The agency said in a statement that wage disparity conversations should continue and "we are committed to being part of the solution".