Britney Spears is free to choose her own attorney in her conservatorship case, a Los Angeles judge ruled Wednesday. The pop singer indicated in a petition to the court that she wanted to be represented by attorney Matthew Rosengart, a former federal prosecutor who, in the past, represented Steven Spielberg and Sean Penn. Her former court-appointed lawyer, Samuel Ingham, on July 6, filed documents in Los Angeles Superior Court to resign from her conservatorship case. He said his resignation would take effect as soon the court appoints Spears a new attorney. The judge on Wednesday approved Ingham’s resignation as well as that of wealth management company Bessemer Trust of California who resigned on July 1 as a co-conservator of the 39-year-old singer’s estate. Spears’ father, Jamie Spears, has since been the sole conservator of her financial dealings. Last month the singer testified that the conservatorship was so “abusive,” she wanted …