Britney Spears' new lawyer, Mathew Rosengart, made a direct petition to remove the singer's father Jamie Spears from her conservatorship on July 26.
Now court documents filed by Rosengart allege that dad Jamie authorized a payment of $500,000 from her estate without consent.
Mathew Rosengart has filed a motion to have Jamie removed as conservator of Britney estate amid claims he "dissipated" her fortune, Buzzfeed reports.
A hearing is now set for September 29, however, Rosengart urged Judge Brenda Penny to bring the hearing date forward to August 23, or as soon as possible after.
The motion claims Jamie "grossly overpaid" a company run by Britney's former business manager Lou Taylor, by handing over $500,000 from her estate.
Britney's lawyer went on to allege that Jamie gave Taylor's company Tri Star Sports and Entertainment the cash in December 2019, explaining that this was $300,000 more than was due.
Rosengart wrote: "In December 2019, Mr. Spears inexplicably approved a payment to Tri Star in excess of $300,000 above the approximate $200,000 that was supposedly payable to Tri-Star at the time.
"This $300,000 payment was not due to any extra duties or work performed by Tri-Star. To the contrary, for whatever reason, Mr. Spears complied with Tri-Star's request for a $500,000 payment from the Estate as a 'floor.'
"More problematically, this payment was sought (and paid) despite Ms. Spears's indefinite early-2019 hiatus."
"Rather than negotiating a new, less lucrative agreement as a result of Ms. Spears's hiatus, or moving Ms. Spears's business management elsewhere, Mr. Spears allowed Tri-Star to siphon more than twice Ms. Spears's annual allowance out of her Estate, while Ms. Spears was on hiatus," he added.
It comes as Rosengart alleged that Jamie is paying himself more than he pays his daughter.
Court documents filed by Rosengart allege that dad Jamie has been paying himself $16,000 a month since 2009 through Britney's estate, Insider reports.
"Mr. Spears has profited handsomely from his daughter's conservatorship. By way of illustration only, since at least 2009, Mr. Spears has been paying himself $16,000 per month from Ms. Spears's Estate, $2,000 more than he has allotted to Ms. Spears," Rosengart wrote.
"Mr. Spears also pays himself an additional $2,000 per month for office expenses — again, from Ms. Spears's Estate," Rosengart added.
The legal papers go on to say Britney "continues to suffer ongoing harm each day that Mr. Spears remains in place as the Conservator of the Estate - emotionally, psychologically, and financially."
Jamie has yet to respond to the latest allegations but has previously said he has always acted with his daughter's "best interests" at heart.