Watch: Arnold Schwarzenegger's Son Christopher Shares Glimpse at Weight Loss TransformationChristopher Schwarzenegger can carry all the pumpkins in the patch. The 28-year-old son of Arnold Schwarzenegger and Maria Shriver-who revealed earlier this year that he's lost 30 pounds-showed off his sculpted arm muscles in a white tank top while on a trip to a pumpkin patch in Brentwood, Calif. on Oct. 27. Fittingly for his new bulked-up look, he also appeared to be drinking what appears to be a protein shake.