Many of Britney's supporters grew worried after her Instagram page was deleted without warning.
He said his daughter had made it clear she wanted to be freed from the arrangement.
The singer's legal team is calling for the immediate resignation of Jamie Spears from the conservatorship.
The singer is currently fighting to have her father removed as her legal conservator after 13 years.
Mathew Rosengart is the first conservatorship attorney Britney has been able to hire of her own choosing.
The singer also claimed that her “support system hurt me deeply” and that the conservatorship she's under “killed my dreams”.
"Please stop with the righteous approach when you’re so far from righteous it’s not even funny," she wrote on Instagram.
The singer was clearly in the mood to celebrate after being granted permission to choose her own legal representative.
"I want him removed and I want investigations. And I think that's it."
Madonna Says Britney’s Conservatorship Is 'Violation Of Human Rights': ‘Give This Woman Her Life Back’
The singer is the latest star to speak out in support of Britney.