British actress Lena Headey has filed for divorce from musician Peter Loughran in Los Angeles Superior County Court, records show. People.com reported Wednesday Headey, in papers filed July 20, cited irreconcilable differences as the reason for the breakup of the marriage. She and Loughran married in May 2007 and separated last year, the celebrity news Web site said. They have a 2-year-old son together. Headey is one of the stars of TV\'s \"Game of Thrones.\"