Heather Mills, the estranged wife of Sir Paul McCartney, is set to sue her former legal firm for 'misrepresentation', according to reports The model/activist is set to face her husband in court next week (begs10Feb08) during a scheduling hearing as part of their divorce proceedings, but could be facing another legal battle with former lawyers Mischon de Reya. The legal firm dumped Mills in November last year (08), reportedly because the star defied a gag on talking about the couple's daughter Beatrice, four. In December (08), the company threatened legal action over $4 million (GBP2 million) in outstanding bills in relation to her bitter divorce from MCCartney, and are said to be keen to press ahead with the case. However, Mills is planning to countersue Mischon de Reya over allegations of "bad representation". Mills and MCCartney's divorce case will continue next week (begs10Feb08) - with Mills representing herself in court. The couple split in 2006.