Singer Frankie Valli (search) has filed for divorce from his wife of 20 years, according to court documents.

Divorce papers filed Friday in Los Angeles Superior Court show that Valli, 67, and his estranged wife, Randy, separated Thursday.

The couple have 10-year-old twin boys and a 17-year-old son.

Valli, a Newark, N.J., native whose real name is Frank Castelluccio, was inducted in 1990 into the Rock and Roll Hall of Fame (search) as a member of The Four Seasons.

He's known for hits such as "Sherry," "Walk Like a Man," "Rag Doll" and the theme song from "Grease."

Valli has appeared on HBO's "The Sopranos" (search) and in several films, including "Witness to the Mob," "Modern Love" and "Sgt. Pepper's Lonely Hearts Club Band."