Sia's estranged husband is seeking more than $250,000 per month in spousal support

According to court documents obtained by Us Weekly, Dan wants Sia to pay at least $300,000 towards his attorneys' fees, as well as $200,000 for a forensic accounting investigation.

He said in a written statement to the court: "I have no income, no real property, no retirement and very little funds in my bank account. I cannot maintain this litigation without a significant contribution by Sia toward my attorneys' fees and forensic accounting fees. Sia has the greater ability to pay for both of our legal fees. I therefore ask the Court to level the playing field and order Sia to contribute no less than $300,000 toward my attorney's fees and costs and $200,000 toward my forensic accounting fees and costs."

Dan claimed he has been unemployed since April 1 after he "received a letter from Sia's company providing me with notice that it would be terminating her funding" of their joint business, Modern Medicine.

He added that since then he had been living on "monthly payments from Sia by way of stipulated orders" before those ended on October 1.

The couple share an 18-month-old baby named Somersault Wonder, while Sia also has two sons she adopted as teens.

She requested legal and physical custody of their child in March and asked the court to terminate a spousal support option for her estranged husband.

Sia was previously married to documentary filmmaker Erik Anders Lang from 2014 to 2016.

Speaking previously about the split, she told Apple Music 1's Zane Lowe: "That was such a dark time that I was in bed for three years, really, really severely depressed. And so, I couldn't really do anything for that period of time."