When Britney Spears had her breakdown in 2008 (think shaved head and window smashing), her father and attorney became her conservators. In Ohio, they would be known as guardians. They manage both her physical well being and her finances. As such, they make sure she takes her medicine for her unspecified illness as well as manage her career.
In recent years, Britney, who has been described as shy has not testified at hearings about continuing the conservatorship. She reportedly is only interested in seeing her sons. Her father receives 1.5% of the $17.5 million annual revenues from her Planet Hollywood shows and the same cut from the merch sales. Her court appointed attorney has received $2 million in fees since 2008 and the other conservators have received $6.7 million.
Three brief points:
1. Britney clearly needed someone to assist her in 2008 while she was crumbling. She is likely still alive, while Michael Jackson and Prince are not, because of that.
2. Guardianships can be temporary and Britney's seems to be a perfect example of temporary intervention being all that is required. She should have the right to make stupid decisions on her own.