Toxic Britney Spears is still not fit to participate in legal matters concerning  her estate, according to the star's lawyer. The former singer was committed to a psychiatric facility earlier this  year to be treated for her bi-polar disorder. Her dad, Jamie, was subsequently  appointed conservator of her legal and financial affairs. Britney was also stripped of custody of her two children, but she has  since made good progress and has been granted limited access to Jayden James and  Sean Preston as part of her ongoing custody battle with ex-husband Kevin  Federline. But a Los Angeles California court heard last week, that the star is still not well  enough to participate in any legal proceedings. Her attorney told the court that  her doctor hopes to carry out "additional testing in the not-too-distant  future."Her father's legal team is expected to file a business plan for Spears'  estate by June 13.Photo By: Manuel Valasco/BuzzFoto