Diane Lane Josh Brolin

Diane Lane has already pulled the trigger in her divorce from Josh Brolin, filing the papers in L.A. Superior Court and citing irreconcilable differences.

Lane signed her divorce documents on Valentine's Day, citing February 13 as the date of their official separation, although sources say it was earlier than that.

"They've been separated for several months. This was a hard decision for both of them to make," says a source close to Diane Lane and Josh Brolin.

"The relationship just ran its course."

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Diane Lane and Josh Brolin have announced they will divorce after eight years of marriage.

"Diane Lane and Josh Brolin have decided to end their marriage," the actors' reps said.

Adds an insider: "It was a mutual decision. It is very amicable. It's not ugly, it's just over."

The spouses, who wed in 2004, split a few months ago. They have no children together.

Lane was previously married to actor Christopher Lambert from 1988-1994, and Brolin to Alice Adair, with whom he has two kids, Trevor, 24, and Eden, 18.

We wish both of them the best during what is surely a difficult time.