Arnold Schwarzenegger gushed about being a grandfather and admitted he didn't know the gender of pregnant daughter Katherine's baby on Thursday on a talk show. The 74-year-old actor while visiting Jimmy Kimmel Live was congratulated by the host for Katherine, 32, and her husband Chris Pratt, 42, blessing him with another grandchild 'on the way'. 'It's on the way, and I'll tell you one thing, that it is the easiest ...