The parents of Hollywood stars Jake and Maggie Gyllenhaal are set to divorce after over 30 years of marriage.Naomi Foner filed for divorce from Stephen Gyllenhaal at Los Angeles' Superior Court on Wednesday, citing irreconcilable differences.Screenwriter Foner married film director Gyllenhaal in April, 1977; giving birth to Maggie in 1977 and Jake in 1980.The couple announced they had separated earlier this month.