Sean Penn may soon be a single man walking.
Robin Wright Penn has filed for divorce from the actor and director, according to media reports.
Papers were filed Dec. 21 in California's Marin County Superior Court. Wright Penn cited irreconcilable differences as a reason for the split, which was first reported by the Web site CelebTV.com.
The couple has two teenage children and are seeking joint custody.
Penn directed "Into The Wild" and starred as a death row inmate in "Dead Man Walking."
Wright Penn's acting credits include "Beowulf" and "Breaking and Entering."