Cameron Diaz is in negotiations to star in Warner Bros.’ upcoming legal film Bobbie Sue, EW has learned exclusively. The actress would play a ballsy New York attorney who is brought into a prestigious, sexist law firm to litigate an important client’s sexual discrimination suit. The project, based on a spec script from screenwriters Russell Leigh Sharman, Owen Egerton, and Chris Mass, was picked up recently by Warner Bros. and fast-tracked after Diaz showed interest. Dana Fox (screenwriter of Diaz’s What Happens in Vegas) is doing a polish on the script now. Donald De Line will produce. No director has been hired yet.