Britney Spears is seeking a temporary restraining order against her former manager Sam Lutfi to keep him out of her life.

The singer's attorney has filed documents on her behalf in Los Angeles, asking for protection for his client, her father and two sons.

According to the documents, obtained by The Blast, Lutfi has been sending harassing and threatening texts and tweets to Britney and her family, causing the star "severe mental trauma" while interfering with her life.

Lutfi, who was the Toxic star's manager ahead of her meltdown a decade ago, also reportedly sent Britney’s mother, Lynne, an "unhinged" text last week, insisting she should be more involved in her daughter's affairs.

He suggested Britney was spiralling out of control after recently completing a mental health programme.

He reportedly told Lynne, "You are the one that’s been breaking your back for your children your entire life and yet you are still having to answer to people that have done nothing for your family yet they are in charge.

"You need to stop allowing anyone to treat you poorly."

Ironically, Lynne has since filed documents demanding to be included in the ongoing conservatorship case swirling around her troubled daughter.

Lutfi previously sued Lynne after she accused him of contributing to Britney’s illness. The two parties settled for an undisclosed amount.

She plans on attending the latest conservatorship hearing on Friday (10May19).