R&B singer Faith Evans -- who was once married to Notorious BIG -- has slapped Todd Russaw, her estranged husband and manager, with divorce papers citing irreconcilable differences. According to the legal docs, obtained by the folks over at TMZ, the couple separated in December 2005 and have two minor children (Joshua, 13, and Ryder, 4, who was born after the couple officially separated). She's asking for joint legal and sole physical custody and wants the judge to reject any claim of spousal support. In January 2004, Faith and Todd were charged with possession of cocaine and marijuana after they were pulled over for a routine traffic accident. In lieu of going to jail, the couple took a deal and agreed to enter a 13-week drug-treatment program. Then in 2010, Faith was arrested for DUI in Los Angeles.