Credit: Flynet

Lunchtime for the Shriver-Schwarzeneggers.

On Wednesday, Maria Shriver hit an eatery in L.A.'s Brentwood area with her daughter Christina, 19, and son Christopher, 13. Shriver, 55, and estranged husband Arnold Schwarzenegger have two more children Katherine, 21, and Patrick, 17.

The trio kept somber expressions as they headed out for their midday meal.

As the world now knows, actor-turned-politician Schwarzenegger, 63, fathered a fifth child with a household staff member (reportedly housekeeper/assistant Mildred Patricia Baena) -- said to be a boy who may have been born within weeks of Christopher. Shriver moved out of the family's Brentwood mansion earlier this year following her husband's private confession.

"You have no idea how humiliating this is for her," one Shriver pal told Us Weekly.

"She spent a lot of time ... defending Arnold's character...She had no idea about the child."

Older brother Patrick admitted on Tuesday that he was suffering from his family drama. "Some days you feel like sh*t, some days you want to quit and just be normal for a bit, yet I love my family till death do us apart," he Tweeted.