Updated

Christopher Schwarzenegger has been released from the hospital after being hurt in a surfing accident more than a week ago, his mother Maria Shriver tweeted Tuesday.

Christopher, the youngest child of Shriver and Arnold Schwarzenegger, was hospitalized July 17 with multiple broken bones and a collapsed lung as a result of an accident while he was boogie boarding on Malibu Beach in southern California.

"Blessed to be able to take Christopher out of the hospital last night. What a feeling of relief to know that he's going to be fine," Shriver, 55, tweeted about her 13-year-old son.

"I will forever be grateful to the amazing doctors, nurses and hospital staff in the ICU who helped my son," she added.

Schwarzenegger, 63, and Shriver are in the process of divorcing after 25 years of marriage following the revelation that the former California governor had fathered a child with a housekeeper who worked in the family's home for 20 years.

Despite the split, both parents were at their son's side at the hospital.

"I knew Christopher couldn't be stopped! Big thanks to all the doctors, nurses & staff at UCLA that helped him recover," Arnold Schwarzenegger also tweeted, echoing Shriver's sentiments.

The two are also parents to daughters, Katherine, 21, and Christina, 20, and son Patrick, 17.