Britney Spears' dad took 'unwarranted commissions' from her work that totaled millions of dollars, new court documents claim

• New court documents filed by Britney Spears' legal team said that her father paying himself.
• "He took unwarranted commissions from his daughter's work totaling millions," Mathew Rosengart said.
• The next hearing is on September 29, where a judge will address Jamie Spears' fate as a conservator.

New court documents filed by Britney Spears' legal team on Wednesday alleged that her father and conservator Jamie Spears has taken millions of dollars in unwarranted commissions from his daughter's work over the years.

In the new filing reviewed by Insider, Britney Spears' lawyer Mathew Rosengart said his client called for the immediate removal of her dad as a conservator, and that ending the conservatorship would be the next and final step after that.

The next hearing in the conservatorship case is scheduled for September 29, where a judge will potentially rule on Jamie Spears' fate as a conservator. Jamie Spears has managed his daughter's estate, finances, and much of her personal life since a court-ordered conservatorship was established for the pop star in 2008.

"Relatedly, although our investigation is ongoing and further investigation is warranted, Mr. Spears's mismanagement of Ms. Spears's Estate is evident and ongoing," Rosengart said in the new filing. "He took unwarranted commissions from his daughter's work, totaling millions of dollars; he takes a 'salary larger than his daughter's."

Rosengart added that Jamie paid himself for an "unused 'office' space," and alleged that Jamie "failed to negotiate or even obtain a business management agreement from Ms. Spears's prior business manager."

The allegation comes months after Spears' team made a direct petition to remove Jamie Spears from her conservatorship, alleging in July that Jamie Spears had been paying himself $16,000 a month since 2009 through Britney's estate.

Over the summer, Britney spears gave scathing courtroom testimony about her experiences in the conservatorship.

Jamie Spears has said in his own court filings that he will resign as Britney's financial conservator, but so far has refused the request for the resignation to happen "immediately." Jamie also petitioned the court with a request to end Britney's conservatorship altogether - a move that Rosengart said may be an attempt to "avoid accountability and justice."

Representatives for Jamie Spears did not immediately respond to Insider's request for comment.

In the documents filed on Wednesday, Rosengart stated that he and Britney were in agreement about the conservatorship ending but wanted to address Jamie's removal first.

"Ms. Spears will seek appointment of a temporary, short-term conservator to replace Mr. Spears's until the conservatorship is completely and inevitably terminated this fall," the filing said. "In the meantime, if Mr. Spears will not resign now [...] Ms. Spears requests that at the September 29 hearing, the Court suspend Mr. Spears as immediately and formally appoint his temporary successor."

The filings also featured new details about previously reported physical "altercation" between the pop star's father and one of her teenage sons.