Britney Spears' new lawyer just formally requested that her dad be removed and replaced as a conservator of her estate

• A new filing from Britney Spears' lawyer includes a petition to remove her dad from the conservatorship.
• This is the first time the request for Jamie Spears' removal has been made official in the court.
• The filing included a supporting statement from Britney's mother Lynne Spears.

In a new court filing reviewed by Insider, Britney Spears' new lawyer Mathew Rosengart made a direct petition to remove Jamie Spears from her conservatorship.

"For more than thirteen years, Petitioner Britney Jean Spears ('Ms. Spears') has endured a conservatorship that, certainly as it concerns James P. Spears ('Mr. Spears'), has grown increasingly toxic and is simply no longer tenable," the document opened.

"There might well come a time when the Court will be called upon to consider whether the conservatorship should be terminated in its entirety and whether - in addition to stripping his daughter of her dignity, autonomy, and certain fundamental liberties - Mr. Spears is also guilty of misfeasance or malfeasance warranting the imposition of surcharges, damages, or other legal action against him," the petition continued. "Nevertheless, although our investigation into these issues and others is active and ongoing, this Petition does not ask the Court to address such issues today. Instead, this Petition asks the Court to take the initial narrow step, within its broad discretion, of removing Mr. Spears as conservator on grounds that do not even require Mr. Spears to be at, or admit to, fault."

The court filing goes on to request that Jamie Spears be replaced as the estate's overseer by a man named Jason Rubin, who is reportedly a professional fiduciary and CPA living in Los Angeles.

Britney Spears' mom said that the relationship between Britney Spears and her father has 'dwindled to nothing but fear and hatred'

The petition included statements from Jodi Montgomery, a coconservator tasked with overseeing Britney's personal affairs, and Britney's mother Lynne. They each detailed their support of this petition.

"I became involved in this conservatorship because I wanted to ensure that everything in my daughter's life was handled in the best interests of my daughter the conservatee, which I did not believe at the time (and I still do not today) to be the case," Lynne Spears wrote in her statement.

Montgomery, who was brought on as a coconservator in 2019, said she's been familiarized with the "elaborate procedures and processes involved with Ms. Spears' daily activities." During the course of her duties, Montgomery says she has "worked closely" with Jamie Spears.

"Ms. Spears' has serious, unresolved issues with her father Mr. Spears sourcing back to her childhood that cause her great distress and emotional upset," Montgomery's statement says. "This distress and upset is genuine and real. During my tenure, I have personally observed dynamics at play between Mr. Spears and his daughter Ms. Spears that are not psychologically healthy and supportive for Ms. Spears and her mental condition."

Last week, Rosengart told reporters he was working "aggressively" to have Jamie Spears ousted from the conservatorship.

The next hearing in the ongoing case will take place on September 29.

This is a developing news story. Please check back for updates.