The couple married in 2004 and split up earlier this year.
People.com said Monday their divorce was finalized last week.
Lane, 48, had legally changed her name to Diane Lane Brolin but has since dropped her ex-husband's last name, the celebrity news website said.
Brolin, 45, checked into a rehab facility last month following several public, drunken altercations.
Notable deaths of 2014 [PHOTOS]