'CSI' Star Countdown to Bachelorettehood

12/22/2009 2:50 PM PST

'CSI' Star -- Countdown to Bachelorettehood

For the first time in 20 years, "Crime Scene Investigation" star Marg Helgenberger will experience Valentine's Day as a single woman ... thanks to an L.A. County Judge.

TMZ obtained court documents which show Helgenberger's divorce from former Screen Actors Guild president Alan Rosenberg will become final on February 1, 2010.

Marg and Rosenberg were married back in 1989 -- they have one child together.