Jamie Spears was appointed her guardian in 2008, amid concerns over her mental health. On Wednesday, a judge handed the role to a man appointed by Spears.
Earlier this month, Spears had filed to end the conservatorship after his daughter requested another guardian.
Fans around the world have supported her through the #FreeBritney campaign.
In a court hearing in Los Angeles, Judge Brenda Penny formally ended the conservatorship that the star had with her father, but left in place a separate conservatorship with an accountant chosen by Spears' legal team.