Tom Arnold has filed papers to become legally separated from his third wife Shelby Roos, four years after getting married.

The comedian's previous two marriages, to Roseanne Barr and to Julie Champnella, both ended in divorce after four years, but it appears that Arnold is still somewhat hopeful of salvaging his third attempt at wedded bliss.

His representative Staci Wolfe told People magazine: "He doesn't know what the future holds, but he does care deeply for her."