LOS ANGELES (AP) _ Actress Denise Richards has filed for divorce from her actor-husband Charlie Sheen, citing irreconcilable differences, according to court papers filed Wednesday.

Richards, 34, is six months pregnant with the couple's second child. They also have a daughter, Sam, who will be a year old next week.

The couple married in June 2002 and co-starred in ``Scary Movie 3.'' Richards and Sheen, 39, met while shooting the independent film ``Good Advice'' in 2000.

They began dating after Richards guest-starred on Sheen's former series ``Spin City.'' The marriage was Sheen's second and Richards' first.

Sheen, who now stars in the CBS sitcom ``Two and a Half Men,'' is best known for his work in the movies ``Platoon,'' ``Ferris Bueller's Day Off'' and ``Hot Shots.''

Richards, a former Bond girl, has appeared in a host of movies, including ``Wild Things'' and ``Starship Troopers.''