Khloe Kardashian has just filed court documents to divorce Lamar Odom and restore her name -- TMZ has learned.

As we first told you, Khloe planned to pull the trigger today on her 4-year marriage to Lamar, who has been deep in the world of drugs on and off for the last 2 years.

In the legal docs, filed by disso-queen Laura Wasser, Khloe cites "irreconcilable differences."

As we previously reported, the couple has a prenup so division of property will be a cinch -- they kept all their property separate.