US screen star Robin Wright Penn has filed for legal separation from her Milk actor husband of 13 years, Sean Penn, citing "irreconcilable differences".
The couple, who married in 1996, first seperated and instigated divorce proceedings in December 2007 - during which time Sean was romantically linked to model Petra Nemcova. He and Robyn were reunited four months later, however.
They began divorce proceedings once again in May, but, later called it off.
The couple have agreed to share custody of their son Hopper, 16. They are also parents to 18-year-old daughter Dylan.
Oscar-winner Sean, who was previously married to Madonna, raised eyebrows during his acceptance speech at the Academy Awards, in which he didn't mention his wife.
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