Credit: Chelsea Lauren/FilmMagic

She might not be Mrs. Schwarzenegger much longer!

A source tells Entertainment Tonight that Maria Shriver will likely be filing for divorce from estranged hubby Arnold Schwarzenegger by the end of this week.

On May 9, the couple announced they were separating after 25 years of marriage; Schwarzenegger, 63, also admitted to fathering an illegitimate child during his marriage to Shriver, 55. The alleged mother of the child, Mildred "Patty" Baena, worked as a housekeeper in the Schwarzenegger household for 20 years.

A pal of Shriver's told Us Weekly that the former First Lady of California is trying to keep things friendly for the sake of her and Arnold's children: Katherine, 21, Christina, 19, Patrick, 17, and Christopher, 13.

"As hurt as she may be, she will encourage them to forgive their father,"the source said, adding that Shriver's "faith and her focus on family" is getting her through.

The former TV journalist appeared on Oprah Winfrey's surprise anniversary show last Tuesday, and may appear on Wednesday's live show. "She will be ok because she has so many who love her and support her," a second insider said. "She is putting one foot in front of the other."