EXCLUSIVE: Charlie Harper’s mom has always been an important part of Two And A Half Men. Now we’ll get to meet the mother of new lead Walden Schmidt (Ashton Kutcher). Mimi Rogers has been tapped to guest star as Walden’s mom in at least two episodes of the veteran CBS comedy series. And if you wonder where computer genius Walden got his brains from — his mother is a noted primatologist, a la Dian Fossey.