Sean Penn and Robin Wright Penn headed for divorce - again

Sean Penn Robin Wright Penn

, we immediately thought of Oscars night in February.

There was Penn on stage, thanking everyone under the sun who helped him win the Best Actor trophy for his portrayal of Harvey Milk in "Milk.'

Everyone, that is, but the woman he's been married to for 13 years, who was sitting right there in the audience, smiling, playing (so it seems now) the adoring wife.

Who does that?

This has been a rocky marriage for a couple of years now. She filed a divorce petition in December 2007, citing irreconcilable differences and seeking joint custody of their two children. Penn and Wright Penn, 43, have a daughter, 18-year-old

Dylan Hopper Jack

, 15.

Penn, 48, filed for legal separation last Friday.

People magazine points out that Penn's oversight on Oscars night might have been a sign of things to come, noting other Oscar winners, including

Reese Witherspoon Halle Berry Hilary Swank
Julia Roberts

who forgot to thank their significant others in their acceptance speeches - and later lost their loves.

| Lisa Gutierrez, The Star