Arnold Schwarzenegger and Maria Shriver's son Christopher is showing up and showing off after his 30-pound weight loss journey. The 27-year-old showed off his new physique while scrolling through his phone in photos shared by his sister Katherine via Instagram Friday, August 22. Katherine, 35, shared a series of photos of a family trip to Cape Cod. The snaps also included three of Shriver, who was all smiles as she enjoyed a boat trip with her children and grandchildren. "A perfect day ," Katherine captioned the post.