We just got info that Usher filed for divorce early this morning in Atlanta:

Usher and stylist Tameka Foster have been living apart for the past year, according to U.S. publication In Touch.
Divorce papers were filed in Atlanta, Georgia on Thursday morning (11Jun09). The shocking news comes just four months after Foster suffered cardiac arrest during cosmetic surgery in Brazil. At the time, Usher, who flew to be by her side, insisted he had no idea his wife was there for the procedure. A source close to the couple says, “Usher’s primary concern is for his children. He is a great father and just wants to do what is right for them.” The couple has two kids together, Usher Raymond V, 18 months, and Naviyd, six months.