Zap2It.com reports that Ozzy Osbourne's son 16-year old son, Jack, was injured Wednesday when he and several friends were attempting cannonballs off the Malibu Pier in Southern California.

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The young star of MTV's "The Osbournes" suffered an arm injury, and was taken to Malibu St. John's Urgent Care center for treatment. Norton Wisdom, a Los Angeles County lifeguard, tells the AP, "I looked up and there were a bunch of kids doing cannonballs off the Malibu Pier, which is illegal."

Osbourne was on the pier with a film crew at the time. After his injury, area lifeguards stabilized his arm and treated him for mild shock. The film crew did not have a permit to be on the pier and left the area, Wisdom said.