Arnold Schwarzenegger's son Christopher has been on an incredible weight loss journey for several years now. The 27-year-old son of Arnold and Maria Shriver (pictured above, left in 2017) was just shown with a much, much slimmer figure as part of an Instagram photo carousel shared by his sis Katherine Schwarzenegger Pratt on Saturday. And to say there's been a massive change would be, well, a massive understatement. Related: Maria Reveals She Tried To Go Live In A CONVENT After Arnold Cheating Scandal! First, let's go back a bit.