By Breaking Celebrity News Staff

Arnold Schwarzenegger and Maria Shriver's youngest son Christopher was involved in a boogie boarding accident in Malibu last Sunday, and was being held in a Los Angeles-area hospital in serious condition as of Friday.

The boy, 13, reportedly suffered a collapsed lung, broken bones and broken ribs during the outing, a source told People, which occurred while he was with his mother.

"Christopher has been in ICU since Sunday," the source said. "Maria has not left his side and is sleeping at hospital."

The family has been quiet on Twitter this week, with only Christopher's older brother Patrick tweeting, unrelated to the unfortunate occurrence.

We here at Breaking Celebrity News wish Christopher a speedy recovery.

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