Watch: Arnold Schwarzenegger's Son Christopher Shares Glimpse at Weight Loss TransformationThe Schwarzeneggers are back...on your Instagram feed.Katherine Schwarzenegger posted a series of photos of her family-including mom Maria Shriver, uncle Anthony Shriver, husband Chris Pratt and brother Christopher Schwarzenegger-having a "perfect day" out on the water in Cape Cod Aug. 22.And while the water was crystal clear, many of the author's one million followers seemed to be drawn to her little brother, who was showing off the results of his weight-loss journey.