Robin Wright Penn has filed for divorce from her husband Sean Penn again.

The papers, filed in Marin County, California, on Aug. 12, state that "both parties have already agreed to [shared] custody" over their minor son, Hopper Jack, 16, and that "the estranged couple have already agreed to division of all property."

The reason for the split is listed as "irreconcilable differences." Wright Penn, best known for roles in The Princess Bride and Forrest Gump, is not seeking spousal support.

Together since 1989 and married in 1996, the couple endured a roller-coaster relationship, filing papers to initiate divorce not once, but twice – only to patch things up again as recently as May.

In an interview released Monday, the actress told More magazine that she had no plans to reconcile with her husband. Robin said:

"I hit that crossroad a while ago. I know what I don’t want."

I am actually hoping they just get it over with this time, so congrats, or condolences, or whatever. Life would be so much easier is marriages could end without a messy divorce.

About a year ago Robin Wright Penn has filed for separation from Sean Penn, then the couple tried to repair the marriage, but it seems the marriage failed again. Sean has now filed for legal separation on April 24.

The couple, who married in 1996, would have celebrated their 13th anniversary on Monday. They have two children together, Dylan and Hopper Jack.

We hope the couple remain civilized, and continue to raise the children together.

Sean Penn and Robin Wright asked in court to have their divorce proceedings dismissed yesterday, and their request was granted. The reconciliation came only hours after the couple attended an Eddie Vedder concert last night in San Francisco, where Sean got on stage to dedicate a song to Robin in honor of her birthday.

Although Sienna Miller isn’t being blamed directly for causing Sean Penn and Robin Wright to initiate a divorce, Sienna certainly didn’t help matters. Rush and Molloy report:

A source recalls a party in a suite at a New York hotel where they both were staying.

"Sienna was sitting on Sean’s lap," according the source. "She was dressed very sexily. She had her arm around his neck." That night, claims the source, they stayed up quite late.

One Penn friend maintains there was never anything romantic between them. "Sienna is like that with everyone," says the friend. "She’s very physical. She drapes herself over people she likes. She doesn’t mean a lot by it."

Sienna acts like a slut. She can’t help who she is. I’d put on a wet suit though, before she sat on my lap.