Britney Spears has said she blames her mother for the conservatorship that has controlled her life for 13 years.

Axar.az reports that the star's father Jamie has been the public face of the legal arrangement that means the pop star has minimal say in her personal and financial affairs.

But writing online, the singer claimed it was her mother Lynne's idea.

"What people don't know is that my mom is the one who gave him the idea," she said. "I will never get those years back... she secretly ruined my life."

In the now-deleted Instagram post, she continued: "You know exactly what you did. My dad is not smart enough to ever think of a conservatorship, but tonight I will smile knowing I have a new life ahead of me."

Spears' post appears to have been prompted by her father requesting the "immediate" and "unconditional" termination of the conservatorship.

The arrangement is a form of legal guardianship normally granted for people who are unable to make their own decisions, like those with dementia or other mental illnesses.