Oksana Grigorieva has requested an increase in her monthly payments from $US20,000 ($AU26,000) to over $US100,000 a month (or $US 1.2 million per year). The estranged couple is reportedly set to go to trial over the demand.
The Russian-born pianist claims the increase is due to security measures for her daughter. However, Grigorieva has yet to specify why more than $US100,000 is required, or why their daughter is at risk.
Watch: Ricky Gervais and Mel Gibson had an unscripted verbal altercation at the Golden Globes.
Entertainment website TMZ broke the story, claiming she is seeking the payment to support her ‘lavish lifestyle’, with travel and lodgings also listed as reasons behind the increase.
Grigorieva filed for bankruptcy less than four years after knocking back a reported $15 million child custody settlement from the actor who is worth an estimated $425 million.
In June 2015, a Los Angeles court granted Gibson a month long stay in Australia during pre-production for new film, Hacksaw Ridge. It is understood that Oksana objected to her daughter spending time overseas with her father.