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Sean Penn and his wife Robin Wright Penn have both filed divorce papers -- Sean's filing was later dismissed, but Robin's stands, according to People.

They are both cited "irreconcilable differences" and both seek joint legal and physical custody of their two children, Hopper, 14, and Dylan, 16. Sean and Robin were married in April 1996 -- they'll celebrate what would have been their twelfth anniversary with an April 2008 hearing.