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Vivian addressed the legal battle - in which Britney is fighting for her dad to be removed from his role of conservator - during an appearance on Good Morning America.
"I understand that every story needs a villain, but people have it so wrong here," she said.
"This is a story about a fiercely loving, dedicated and loyal father who rescued his daughter from a life threatening situation. People were harming her and they were exploiting her. Jamie saved Britney's life."
Vivian also discussed Britney's financial situation back in 2008, with Jamie's legal team claiming Britney's estate was only worth $2.8 million (£1.9million) when he stepped in as conservator. The court has been told her estate is now worth $60 million (£42.7million).
"Britney's assets were clearly being mismanaged and she was being taken advantage of financially by some of those around her," added Vivian.
As conservator, Jamie has had control over 39-year-old Britney's life for more than a decade, when the pop star suffered a very public breakdown 12 years ago.
Conservatorship is when a person is appointed by the courts to manage all areas of someone's life (for example, career decisions and finances) if they suffer with physical or mental limitations.
Britney's lawyer, Samuel D. Ingham III, argued last year that the singer was afraid of Jamie and would rather a professional financial institution take over her estate. The lawyer also claimed Britney would not perform again, while Jamie is still conservator.
However, Vivian defended Jamie yesterday, adding: "He has collaborated with her to help her regain custody of her children. He has brought her finances back from disaster. And he's created a safe environment for her to live her life the way she wants, away from the media that cause her so much pain."
Defending his right to his daughter's conservatorship, Britney's dad said previously: "I have and will continue to provide unwavering love and fierce protection against those with self-serving interests and those who seek to harm her or my family."
He later told CNN he was "protecting" his daughter from "those with self-serving interests and those who seek to harm her".
The details around Britney's conservatorship are delved into in The New York Times Presents documentary, Framing Britney Spears which you can watch on Sky Documentaries and NOW TV.
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