Marg Helgenberger Files for Divorce

Marg Helgenberger, the star of "CSI," is going back on the singles market -- the actress officially filed for divorce from her husband, Alan Rosenberg.

In divorce papers filed yesterday in L.A. County Superior Court, Helgenberger cited irreconcilable differences with Rosenberg, who happens to be the president of the Screen Actors Guild -- S.A.G.

The two were married back in 1989, but separated last December.