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Maria Shriver has filed for divorce from cheating husband Arnold Schwarzenegger citing irreconcilable differences, not marital infidelity, as the reason to end their 25 year long marriage.

"Arnold and Maria are on speaking terms and Arnold knew beforehand that she was filing divorce papers. Maria is telling friends she hopes this will be an easy and amicable divorce," a source close to the couple told TMZ.

Arnold, 63, and Maria, 55, married in 1985. The couple have four children Katherine (b. 1989), Christina (b. 1991), Patrick (b. 1993) and Christopher (b. 1997).

They jointly announced their separation on May 10, shortly before Schwarzenegger admitted to fathering a child with a household staffer over a decade ago.

According to TMZ report, the couple did not sign a prenup.

Shriver has asked for spousal support and wants the judge to deny Arnold the right to ask for support for himself.

Shriver is asking for joint custody of their two minor children - Patrick, 17, and Christopher, 13.

The petition has been filed by Laura Wasser. Shriver has also demanded that Arnold pay her attorney fee.

There is no separation date quoted in the papers.

The couple's earnings and property acquired in the 25 years of their married life will be divided equally between the two, but at a later date, according to the documents filed in the court.