The father of troubled singer Britney Spears has strengthened control over her affairs with an order to fire her business manager and a demand that he turn over her personal records, a court document showed.

The document said that Howard Grossman was notified of a court order granting Jamie Spears the right to fire him as the singer's business manager and require Grossman "turn over all documents, records, and assets relating to Britney Spears." The move follows charges by Spear's mother Lynne in court documents made public earlier this week that the pop star's self-style manager, Sam Lufti, had drugged her to take control of her home, life and finances.

Late last week the 26 year-old, who rose to stardom as a Disney child star and became a teenage pop singing sensation, was admitted to a Los Angeles hospital and placed under psychiatric evaluation.

Her father was given temporary control over her affairs by a Los Angeles court.

By Wednesday, Spears had left the UCLA Medical Center and one day later, Jamie Spears was back in court in a closed-door hearing to strengthen his conservatorship over her assets.

Spears' life has spun out of control since her divorce from ex-husband Kevin Federline in 2006. She has spent time in rehab, been photographed in public wearing no underwear and exhibited bizarre behavior such as wearing pink wings and talking in a British accent despite being from Louisiana.

She has battled Federline for custody of their two young sons, and in another public disclosure on Friday, Spears' current Los Angeles attorneys in that case, the firm Trope and Trope, have filed court papers asking to be dropped from the case.

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