A minimum of 17 different lawyers and law firms have been involved with Spears's personal and work life since last year's ruling, the Los Angeles Times reports.
According to accounts filed in Superior Court in Los Angeles earlier this week, Spears's estate paid out a minimum of $2.7 million in fees and costs in the first 11 months of her conservatorship, including $1 million to attorneys representing her father Jamie.
Jamie's lawyer Geraldine Wyle said: "Since the initiation of the conservatorship, as a result of the concerted efforts of Mr. Spears as well as all the professionals involved, all aspects of Ms. Spears's life have been stabilised and continue to improve."
She added that the singer's career "had been revitalised", while she also regained "substantial visitation" with her children and her mental health continued "to mend".
Retired probate judge Arnold Gold said: "It's quite appropriate, particularly in the entertainment field, to incur and have to pay very, very, very sizable attorneys' fees."